Dennis Davis
Dennis Davis
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Calculus Visualized - by Dennis F Davis
This 3-hour video covers most concepts in the first two semesters of calculus, primarily Differentiation and Integration.
The visual and animation style is intended to be informative and provide insights into the logical reasoning behind the rules and formulas in calculus.
Timestamps
0:00 Can you learn calculus in 3 hours?
2:23 Calculus is all about performing two operations on functions
3:32 Rate of change as slope of a straight line
5:37 The dilemma of the slope of a curvy line
7:04 The slope between very close points
11:30 The limit
15:36 The derivative (and differentials of x and y)
21:48 Differential notation
27:58 The constant rule of differentiation
29:15 The power rule of differentiation
35:36 Visual interpretation of the power rule
39:19 The addition (and subtraction) rule of differentiation
41:34 The product rule of differentiation
43:08 Combining rules of differentiation to find the derivative of a polynomial
44:53 Differentiation super-shortcuts for polynomials
48:03 Solving optimization problems with derivatives
52:46 The second derivative
59:59 Trig rules of differentiation (for sine and cosine)
1:05:54 Knowledge test: product rule example
1:06:32 The chain rule for differentiation (composite functions)
1:15:23 The quotient rule for differentiation
1:19:04 The derivative of the other trig functions (tan, cot, sec, cos)
1:20:55 Algebra overview: exponentials and logarithms
1:33:12 Differentiation rules for exponents
1:41:33 Differentiation rules for logarithms
1:45:32 The anti-derivative (aka integral)
1:46:21 The power rule for integration
1:48:32 The power rule for integration won't work for 1/x
1:52:37 The constant of integration +C
1:57:26 Anti-derivative notation
1:59:59 The integral as the area under a curve (using the limit)
2:12:05 Evaluating definite integrals
2:13:11 Definite and indefinite integrals (comparison)
2:15:30 The definite integral and signed area
2:18:10 The Fundamental Theorem of Calculus visualized
2:21:37 The integral as a running total of its derivative
2:24:25 The trig rule for integration (sine and cosine)
2:27:07 Definite integral example problem
2:32:53 u-Substitution
2:42:05 Integration by parts
2:56:03 The DI method for using integration by parts
PROMISED LINKS:
Binomial Expansion (with Pascal's Triangle): czcams.com/video/cvhyJT9c0ac/video.html
Trigonometry Series (by me!): czcams.com/video/U23JMdBIJ0M/video.html&pp=gAQB
KEY RESOURCES FOR PRACTICE:
Steve Chow: @blackpenredpen
100 Derivatives: czcams.com/video/AegzQ_dip8k/video.html
100 Integrals: czcams.com/video/dgm4-3-Iv3s/video.html
100 more Integrals: czcams.com/video/jQz1gQ24OHc/video.html
DI Method for Integration by Parts: czcams.com/video/2I-_SV8cwsw/video.html
Other Great Calculus Resources
Grant Sanderson: @3blue1brown Grant is the grand master of math visualization
Essence of Calculus Series: czcams.com/video/WUvTyaaNkzM/video.html
Michel van Biezen: @MichelvanBiezen (iLectureOnline)
Huge calculus playlist: czcams.com/video/6vRKEXf7uE8/video.html
Mathologer: @Mathologer
Why is calculus so... EASY?: czcams.com/video/kuOxDh3egN0/video.html
The Organic Chemistry Tutor: @TheOrganicChemistryTutor
Learn Calculus Fast playlist: czcams.com/video/GiCojsAWRj0/video.html
There are lots of good resources on CZcams in addition to these.
Key Words:
Maths, differentiation, derivative, integration, integral, limits, tutorial, overview, proof, proofs, animated, animation, explain, explained, A-level maths, O-level maths, IB math, power rule, product rule, quotient rule, u-substitution, integration by parts.
zhlédnutí: 152 982

Video

Deriving the Equations of Motion from V-T Diagrams (Dennis F. Davis)
zhlédnutí 3,3KPřed 11 měsíci
Presentation of the 5 variables for one-dimensional uniformly-accelerated motion (UAM) and the V-T diagram on which they can all be depicted. Then a derivation of the basic equations of motion based on the diagram, geometry and algebra. Sample problems are solved. Link to Conjugate Pairs video (TR-35): czcams.com/video/db0GxUtyqjA/video.html Timestamps: 0:00 - Five Equations of Motion 0:51 - Sa...
Inferential Statistics Part 3: Hypothesis Testing (by Dennis F. Davis)
zhlédnutí 2,4KPřed 11 měsíci
There are two types of Inferential Statistics: Confidence Intervals and Hypothesis tests. This video covers Hypothesis Testing including these topics: Tests of proportions, tests of means, 1-sample tests and 2-sample tests, independent samples, dependent samples, test statistics, critical value, p-value, Type I error, Type II error. Timestamps: 0:00 - Introduction 1:51 - Sample scenario (socks)...
Inferential Statistics Part 2: Confidence Intervals (by Dennis F. Davis)
zhlédnutí 3,7KPřed rokem
There are two types of Inferential Statistics: Confidence Intervals and Hypothesis tests. This video covers Confidence Intervals including these topics: Point estimates, interval estimates, confidence level, alpha level, confidence statements, margin of error, critical value, standard error of the mean, sampling distribution, sigma known and unknown, T-distribution, Z-distribution, confidence i...
Inferential Statistics Part 1: The Sampling Distribution
zhlédnutí 9KPřed rokem
The Sampling Distribution is the keystone to understanding Confidence Intervals and Hypothesis Testing. This video covers Populations, Random Variables, Probability Distributions, Probability Density Functions, Central Tendency, Variability, Dispersion, Variance, Standard Deviation, Normal Curves, Normal Distributions, Z-Score, Samples, Central Limit Theorem. BFW Publishing provides the on-line...
TR-46: Polar Equations (Trigonometry Series by Dennis F. Davis)
zhlédnutí 7KPřed rokem
Plotting polar equations and converting back and forth between rectilinear Cartesian and polar equations. Good video on Completing the Square by @PreMath czcams.com/video/0IFPixtQpYM/video.html Learn @Desmos czcams.com/video/K2mSm9r_T-k/video.html Graphing Roses by @MichelvanBiezen czcams.com/video/y2COhd uUU/video.html The Art of Polar Graphs by Will Brown (@real_willbrown ) czcams.com/video/r...
TR-45X: Polar Coordinates Extra Problems (Trigonometry series by Dennis F. Davis)
zhlédnutí 2KPřed 2 lety
Extra problems for Polar Coordinates. International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11
TR-45: Polar Coordinates (Trigonometry Series by Dennis F. Davis)
zhlédnutí 6KPřed 2 lety
Polar coordinates, converting between Cartesian and Polar coordinates, atan2 and arctan2 inverse trig functions. Pole, polar axis, polar angle. International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11
Elementary Set Theory in 49 minutes
zhlédnutí 37KPřed 2 lety
Introduction to set theory including set definition, set builder notation, binary and unary set operations, identities, and De Morgan's Law. All in 49 minutes. Class 11, Discrete math, Venn diagram, cardinality, element, member, subset, superset, union, intersection, complement, power set, interval notation, relative complement, symmetric difference, Cartesian product, ordered pair, empty set, ...
TR-44: Trig Graph Variations 3
zhlédnutí 6KPřed 2 lety
C parameters for the general trig equation y = A·cos(Bθ C) D. C corresponds to the Phase Shift of the wave function. Series introduction including complete video list: TR-00: [czcams.com/video/U23JMdBIJ0M/video.html] International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11
TR-43: Trig Graph Variations 2 (Trigonometry series by Dennis F. Davis)
zhlédnutí 6KPřed 2 lety
B parameters for the general trig equation y = A·cos(Bθ C) D. B corresponds to the Period and Frequency of the wave function. Series introduction including complete video list: TR-00: [czcams.com/video/U23JMdBIJ0M/video.html] International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11
TR-42X: Trig Graph Variations I - Extra problems
zhlédnutí 1,4KPřed 2 lety
Extra problems for Trig graph variations featuring amplitude and vertical shift. International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11
TR-42: Trig Graph Variations (Trigonometry series by Dennis F. Davis)
zhlédnutí 6KPřed 2 lety
A and D parameters for the general trig equation y = A·cos(Bθ C) D. A corresponds to the Amplitude and D is the 'vertical shift'. Series introduction including complete video list: TR-00: [czcams.com/video/U23JMdBIJ0M/video.html] International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11
TR-41: Half Angle Identities (Trigonometry series by Dennis F. Davis)
zhlédnutí 8KPřed 2 lety
Algebraic and Geometric proofs of the Half-Angle Identity. Series introduction including complete video list: TR-00: [czcams.com/video/U23JMdBIJ0M/video.html] International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11
TR-40: Double Angle Identities (Trigonometry series by Dennis F. Davis)
zhlédnutí 6KPřed 2 lety
Proving and using the Double-Angle Identities for Cosine and Sine. Series introduction including complete video list: TR-00: [czcams.com/video/U23JMdBIJ0M/video.html] International A level, Intl A Level, IAL, Edexcel, Pearson exam board, CIE, Cambridge exam board, P3, P2, Year 10, Class 11
TR-39: Using Sum and Diff Identities (Trigonometry series by Dennis F. Davis)
zhlédnutí 6KPřed 2 lety
TR-39: Using Sum and Diff Identities (Trigonometry series by Dennis F. Davis)
TR-38: Angle Sum and Difference Identities (Trigonometry series by Dennis F. Davis)
zhlédnutí 10KPřed 2 lety
TR-38: Angle Sum and Difference Identities (Trigonometry series by Dennis F. Davis)
TR-37: More Trig Reflections (Trigonometry series by Dennis F. Davis)
zhlédnutí 7KPřed 2 lety
TR-37: More Trig Reflections (Trigonometry series by Dennis F. Davis)
TR-36 - Even and Odd Trig Functions (Trigonometry series by Dennis F. Davis)
zhlédnutí 7KPřed 2 lety
TR-36 - Even and Odd Trig Functions (Trigonometry series by Dennis F. Davis)
TR-00: Introduction to Trigonometry Series by Dennis F. Davis
zhlédnutí 65KPřed 2 lety
TR-00: Introduction to Trigonometry Series by Dennis F. Davis
TR-35: Using Conjugate Identities in Trig Proofs (Trigonometry series by Dennis F. Davis)
zhlédnutí 6KPřed 2 lety
TR-35: Using Conjugate Identities in Trig Proofs (Trigonometry series by Dennis F. Davis)
TR-35X: Using Conjugates in Trig Proofs (Trigonometry series by Dennis F. Davis)
zhlédnutí 1KPřed 2 lety
TR-35X: Using Conjugates in Trig Proofs (Trigonometry series by Dennis F. Davis)
TR-34X: Using Trig Identities (Trigonometry series by Dennis F. Davis)
zhlédnutí 1,4KPřed 2 lety
TR-34X: Using Trig Identities (Trigonometry series by Dennis F. Davis)
TR-34: Using Pythagorean Identities (Trigonometry series by Dennis F. Davis)
zhlédnutí 9KPřed 2 lety
TR-34: Using Pythagorean Identities (Trigonometry series by Dennis F. Davis)
TR-28X: The Law of Sines (Trigonometry series by Dennis F. Davis)
zhlédnutí 1,2KPřed 2 lety
TR-28X: The Law of Sines (Trigonometry series by Dennis F. Davis)
TR-33X: Pythagorean Identities (Trigonometry series by Dennis F. Davis)
zhlédnutí 987Před 2 lety
TR-33X: Pythagorean Identities (Trigonometry series by Dennis F. Davis)
TR-33Z: All Trig Functions on the Unit Circle (Trigonometry series by Dennis F. Davis)
zhlédnutí 22KPřed 2 lety
TR-33Z: All Trig Functions on the Unit Circle (Trigonometry series by Dennis F. Davis)
TR-33A: Trig Functions Animated on a Unit Circle
zhlédnutí 4,3KPřed 2 lety
TR-33A: Trig Functions Animated on a Unit Circle
TR-33: Pythagorean Trig Identities (Trigonometry series by Dennis F. Davis)
zhlédnutí 6KPřed 2 lety
TR-33: Pythagorean Trig Identities (Trigonometry series by Dennis F. Davis)
TR-32X: Introduction to Identities and Proofs (Trigonometry series by Dennis F. Davis)
zhlédnutí 1,3KPřed 2 lety
TR-32X: Introduction to Identities and Proofs (Trigonometry series by Dennis F. Davis)

Komentáře

  • @tombarey
    @tombarey Před 4 hodinami

    Well done.

  • @YERAFirearms
    @YERAFirearms Před 12 hodinami

    Excellent video

  • @donaldfilbert4832
    @donaldfilbert4832 Před 21 hodinou

    I surely wish I had this video when I was learning Calculus in College !! This explanation is SO MUCH BETTER / CLEARER !!! Thanks !!

  • @naldofrasco1467
    @naldofrasco1467 Před 23 hodinami

    @58m50s ... I'm just an engineer and I don't know ! LOL, but you sure know

  • @olharAgudo
    @olharAgudo Před dnem

    One of the best Calculus videos EVER. Crispy Clear!

  • @kerimzunic
    @kerimzunic Před dnem

    In my university we had a course on "stochastic". Where does that term fall within this map? And what would you expect it to include from the topics in the video?

    • @DennisDavisEdu
      @DennisDavisEdu Před dnem

      Stochastic means random. It falls within the Probability section of the map. Stochastic is an adjective that is often used to describe processes (i.e. "stochastic processes"). It means the outcome of each step of the process is uncertain. If you had a course on stochastic processes, I know you already know what follows, but I include it for other readers who may be interested: A classic example of a stochastic process is a "Random Walk": From a starting position, a person walks forward 1 meter. Then they either turn left, turn right or don't turn. Each option has a certain probability and they aren't necessarily equal to each other. Then the process is repeated: they move forward 1 meter in the direction they are facing and them turn (or not) again randomly. The process is repeated, and since the results of each step are random, it's a random (or stochastic) process.

    • @kerimzunic
      @kerimzunic Před 23 hodinami

      @@DennisDavisEdu Thanks for the detailed reply! I wasn't sure how to translate the name of the course as it was "Stochastik" in German, so in English it might be "stochastics" or "stochastic processes" instead of "stochastic". Thanks for the video btw! It really helped me fill out the map of mathematics in my head some more. I studied computer science, but after getting my degree I felt like my math knowledge was still extremely basic, so I'm filling in all of the gaps on CZcams now.

  • @chyldstudios
    @chyldstudios Před dnem

    Do a video on calc 2 and 3

  • @Nukphonik
    @Nukphonik Před dnem

    This ep has been great. I just wanted to revise the math I did at varsity, just to see if i could still do this stuff. My old prescribes varsity books were very ,very , very boring to go through. You simplified this lesson in such a way that brought me up to date, AND, and Dennis, clarified things so crystal clear. I've been doing some problems on my own. my main motivation for this is that I want to understand and have a more clearer understanding, mathematically of a few physics concepts. and recently listening to Eric Weinstein put a flame under my ass. 2nd I want to feel more fluid in applying Calculus to my everyday mediocre problems I'll think about

  • @sirinath
    @sirinath Před 2 dny

    Can you do one on: - Information theory - Markov chains / hidden Markov chains / Semi Markov chains - LA / ML / AI

  • @sirinath
    @sirinath Před 2 dny

    How do you made the visuals and animations?

  • @MathewFletcher
    @MathewFletcher Před 2 dny

    This is so good it's tragic, I could have been in an entirely different career if I had had such a clear teacher as yourself some 30+ years ago. What a marvelous video that will elucidate the many minds out there looking for such explanation your guidance will alter the course of many persons understanding and in some small way change their lives via the confidence they glean from this video.

  • @BlueAccretionDisk
    @BlueAccretionDisk Před 2 dny

    Technically you’re only conceptualizing calculus rather than actually doing the work, which is more than half of the learning, which was mentioned, but let me just re-iterate.

    • @DennisDavisEdu
      @DennisDavisEdu Před 2 dny

      I agree: One cannot absorb an entire year of calculus in 3 hours. Practice is needed. But I think this video is a well-spent 3 hours.

  • @NaaneVinu
    @NaaneVinu Před 2 dny

    I am awaiting a series/big episode of Probailty and Statistics

  • @wyattsbrune7826
    @wyattsbrune7826 Před 3 dny

    Yoo the goat is back

  • @ArturoRenteríaDR
    @ArturoRenteríaDR Před 3 dny

    1:41:30 a fan of LoTR ;)... thanks for this amazing video.

    • @DennisDavisEdu
      @DennisDavisEdu Před 2 dny

      I've made the deliberate choice not to be humorous in my videos, but rather straightforward and concise for the sake of expediency. That's my niche: straight-to-the-point faster than most anyone else. But sometimes I can't help a subtle departure. You're the first to comment on it.

    • @ArturoRenteríaDR
      @ArturoRenteríaDR Před 2 dny

      @@DennisDavisEdu You honestly summed up two semesters of the calculus course very well. I will recommend you to my students as an excellent option for review, thanks.

    • @DennisDavisEdu
      @DennisDavisEdu Před 2 dny

      @ArturoRenteríaDR Great, I hope it is a useful supplement to your instruction.

  • @dogcard664
    @dogcard664 Před 3 dny

    Please let us know how we can support you in making more videos! This video has been a life saver!!! Please keep them coming❤❤❤❤❤❤❤❤❤❤❤

    • @DennisDavisEdu
      @DennisDavisEdu Před 2 dny

      Thanks dogcard. I guess share the channel link with your fellow-learners. For my own reasons, I don't have a social media presence outside of CZcams so any mentions in your sphere of influence might help. Thanks for watching!

  • @dragossorin85
    @dragossorin85 Před 4 dny

    Visualization is key as thousands of words and a lot more time doesn't achive the goal visualization does

    • @DennisDavisEdu
      @DennisDavisEdu Před 4 dny

      I agree. I'd rather be shown than told, so that's what I'm trying to do for learners after me.

  • @DineshKumarCM
    @DineshKumarCM Před 4 dny

    Great video

  • @d.youtubr
    @d.youtubr Před 5 dny

    Please another video with set relations and functions❤

  • @crysania1980
    @crysania1980 Před 7 dny

    Thank you for the video Dennis, I will update you after I take Calculus in the fall. I am not so afraid of failing now. I love how well this video is organized and will definitely use it to supplement what we learn in class. I pray you will always be safe and that you take care of yourself as well so you can make it to retirement and be an amazing and inspiring professor.

  • @GajendraSingh-ip9lk

    Really impressive presentation and exposition on calculus. Anyone can have a good understanding of calculus basics. Thank you.

  • @EinarRisholm
    @EinarRisholm Před 9 dny

    The clarity of this overview is incredible!

  • @cirylsad1
    @cirylsad1 Před 10 dny

    ill forever remain grateful for this vid

  • @christ2551
    @christ2551 Před 10 dny

    I aced calculus in college 25 years ago in college. Now watching this video makes more sense than all those 3 years of college calculus combined. So whoever finds calculus difficult you have hope by watching excellent teaching videos like this. Thank you !

  • @kartiksingh5760
    @kartiksingh5760 Před 10 dny

    @ 1:19:03, is the derivative right? I mean, how come sinx/cos^2x is tanx? BTW, thank you so much for this and trig class. You are the best!

    • @DennisDavisEdu
      @DennisDavisEdu Před 10 dny

      Yes I accidentally dropped a cosine in this example. But the Quotient Rule formula is correct so I hope my error doesn't distract too much from the point.

  • @cruelsummer3021
    @cruelsummer3021 Před 10 dny

    Also noticed a slight error at 2:36:15 where \int{sin(2x)} should be equal to -cos(2x)*2

  • @Serafina_Emerson
    @Serafina_Emerson Před 10 dny

    At 1:19:03 how can you write sin(x) ÷ cos²(x) as simply tan(x) even if we separate the denominators ?

    • @DennisDavisEdu
      @DennisDavisEdu Před 10 dny

      Yes I accidentally dropped a cosine in this example. But the Quotient Rule formula is correct so I hope my error doesn't distract too much from the point.

    • @Serafina_Emerson
      @Serafina_Emerson Před 10 dny

      @@DennisDavisEdu Yes. Thankyou

  • @axelromero5529
    @axelromero5529 Před 10 dny

    Beautiful work... I finally truly understand how the unit circle works and can now draw it on a blank paper simply based on understanding how to get all of the components rather than having to memorize these.

  • @80lala08
    @80lala08 Před 11 dny

    WOAHHHHH!!! YOURE AWESOME SIRRR

  • @80lala08
    @80lala08 Před 11 dny

    wwwoowowowowowowoowowowowowoowowowowowoowowoowowowowowowwoowowoowowowowowowowoowoooowwww!

  • @nrmalgi
    @nrmalgi Před 11 dny

    We need to protect this guy any cost...

  • @nrmalgi
    @nrmalgi Před 11 dny

    What a wonderful video..👏👏👏

  • @三星-y6j
    @三星-y6j Před 12 dny

    amazing instructions . so much logical . even people hate math who like me can't refuse the tuition

  • @mrjnutube
    @mrjnutube Před 12 dny

    A very beautiful video... May I suggest you redo the video, and remove that Red unmoving band occupying ⅓ of the left side of the screen. This is because as much as I would love to watch the video 3 hours straight, I'm afraid my tv would suffer a burn-in image, a ghost image.

  • @AdityaRaj-uu1vs
    @AdityaRaj-uu1vs Před 12 dny

    Sir you made me to fall in love with maths❤❤❤❤❤❤💖💖💖💖💖💖

  • @artmake3
    @artmake3 Před 12 dny

    I made it to 1minute and 48seconds before I was lost...

  • @anthonygarbo8114
    @anthonygarbo8114 Před 13 dny

    I too am a engineer, electrical. I took calculus at the university 55 years ago. If only this video aid and explication was available at that time . . . . great job, Dennis. I'll have to take a look at your other videos.

  • @cruelsummer3021
    @cruelsummer3021 Před 13 dny

    I finished your trig series a few weeks ago. You are godsent! Thank you for this.

  • @jeanotis4133
    @jeanotis4133 Před 13 dny

    Wow, quel beau montage!. I'm an engineer (retired) and i never see a resume like that.

  • @iagainstiification
    @iagainstiification Před 13 dny

    Always wondered what happened to Butthead

  • @Ehtisham101
    @Ehtisham101 Před 13 dny

    At 1:19:03, the presenter forgot to divide the second term by cos(x). Because in the denominator it was cos(x)^2, one of which turned into tan(x), the other got missed out.

    • @DennisDavisEdu
      @DennisDavisEdu Před 12 dny

      Drats I think you're right. Well at least the Quotient Rule formula is correct as provided even if I made a mistake in the example. Thank you for paying such close attention!

  • @Jingaza
    @Jingaza Před 13 dny

    Absolutely amazing sir, what do you use for the wonderful animations

  • @imranhussain-iy8xi
    @imranhussain-iy8xi Před 13 dny

    🇷🇺😙

  • @youfrancis
    @youfrancis Před 13 dny

    This is as close to perfect instruction as I have ever witnessed. BRAVO!

  • @yogithsabarimohan3987

    Thanks you so much

  • @leastofyourconcerns4615

    Straight forward notation for the second derivative is d/dx (dy/dx) This would be very cumbersome if we wanted to keep going and take 3rd, 4th and so on. So to simplify and better convey the concept of further derivatives - for the 2nd derivative the numerator d^2y indicates that we are taking the derivative twice (hence the “2”) of y. The denominator dx^2 suggests that this differentiation is done with respect to x , twice. And we can keep going d^3y/dx^3, d^4x/dx^4... I am not a mathematician, chatGPT is (sorta, kinda lol).

  • @rajkote29
    @rajkote29 Před 14 dny

    "Modern math lectures need to learn these teaching techniques. Wow, you made world students proud that we have Dennis F. Davis!"

  • @ti84satact12
    @ti84satact12 Před 14 dny

    This so well done! What software packages did you use to create this wonderful video!

  • @jrodrigo1984
    @jrodrigo1984 Před 14 dny

    This is a masterpiece. One of the best videos that I've seen on CZcams.

  • @BANSAI578
    @BANSAI578 Před 14 dny

    GOD BLESS YOU! WE WAIT ALGEBRA / ALGEBRA LINEAR/ CALCULUS2