How To Use Reference Angles to Evaluate Trigonometric Functions
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- čas přidán 13. 10. 2017
- This trigonometry video tutorial explains how to use reference angles to evaluate trigonometric functions such as sine, cosine, tangent, secant, cosecant, and cotangent with positive and negative angles in radians and degrees.. You need to have a good understanding of right triangle trigonometry, SOHCAHTOA, 30-60-90 triangle and the 45-45-90 triangle. This tutorial contains plenty of examples and practice problems.
Trigonometry - Basic Introduction:
• Trigonometry
Angle of Elevation Problems:
• Angle of Elevation and...
Evaluating Trig Functions Given a Point:
• Evaluating Trigonometr...
A Simple Way to Remember Trig Values:
• A Simple Trick To Reme...
Exact Value of 5 Remaining Trig Functions:
• How To Find The Exact ...
______________________________
How To Graph Trig Functions:
• Graphing Trigonometric...
How To Graph Sine and Cosine:
• How To Graph Trigonome...
Evaluating Inverse Trig Functions:
• Evaluating Inverse Tri...
Finding The Missing Side of a Triangle:
• How To Calculate The M...
Finding The Missing Angle of a Triangle:
• How To Calculate The M...
Two Triangle Trigonometry Problems:
• How To Solve Two Trian...
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Bearings Vs Direction - Word Problems:
• Bearings vs Direction ...
Bearing Problems and Navigation:
• Bearing Problems & Nav...
Two Triangle Problems - More Examples:
• Trigonometry - How To ...
Trigonometry Final Exam Review:
• Trigonometry Final Exa...
Final Exams and Video Playlists:
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Full-Length Videos and Worksheets:
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thank you SO MUCH mate i was literally at the point of tears because I didn't get it
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Same , and my teacher just skips a bunch of steps. I just can't follow her lol
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MR. Organic Chemistry Tutor, once again, this is another solid analysis of Reference Angle to Evaluate Trigonometry Functions. These videos/lectures continue to be outstanding.
Thank you sooo much, I had struggled doing my homework but my it will be much easier... To be honest I watch tons of video about this but ur method is best of all👊🏻
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wow that's a game change. Thank you very much men, it's really helped me to understand better how to find the reference angle
i still don't get it what the actual hell
kevinmathscience helped me
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I have my trig final tomorrow and im only just now understanding this. thank you for your help!!
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The assignment given to me was completely different than the notes my teacher gave me :))) ty for making this video otherwise I would be lost.
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what about an angle like 205.5? how do you apply the 30,60,90 triangle there?
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Now matter how many videos I watch on this do not understand it
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that moment when a youtube video teaches you more than your math teacher
how do you know which angle to do the sin, cos, tan, csc, sec, and cot from?
how would you know what degrees to pick? is it always on the x-axis the reference angle?
sir i love you so much right now
how do you know that the hypotenuse is 2? when my teacher does it he always puts one and I am really confused 😭
1:34 Why is the hypotenuse always positive?
LoL. This was included in our exam, but my teacher didn't provide ample examples and a clear explanation in our lesson. Thanks for this!!
What do I do if I get like 27 degrees or 68 degrees what do I do then?
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May I ask sir how the sides of the 45 degree angle is 1,1,and square root of 2?
Thanks a lot man
Hi, how can we know if triangles 45° and 45° or 30° and 60°?
Late but look up Unit Circle and that should help.
You saved my life 💖
Thank you
What if you get a smaller negative degree? E.g cos(-15)? How would you make the triangle?
Thank you sir...
What if the angles are not special triangles? What is the number across it?
u arent tested on that ever.
thank you so much
I felt smart for once, after watching this video 😆.
How do you know what the x, ys are to determine what sign they are?
3:40 how do you determine the quadrants if the values are different?
no clue
5:54 when the angle is negative the arrow should be from the first quadrant right?
Tysm mate
thank you
Sir quick question do I have rationalize the answer like -1/√2 to -√2/2 or can I just leave -1/√2
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Gotta love pearson restating the book's confusing wording lmao
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Where do you get the side lengths from???
Thanks
how do we know the values of hypotenuse and lengths of the triangle?
I don't get how to get the signs of each angle.. how can you determine in which quadrant if sin 270 is positive or negative
Because sin 270 lies in third qudrant where sin is negative ..sine angle positive in only first and second qudrant .so sin 270 is negative.
can i just concert the radian into degree using 180/pie instead?
Why did you make the hypotenus which is r positive in quadrant 4?
Isn't x the only side positive?
@organic chemistry tutor
10:12 isnt sin is supposed to be positive in the first quadrant? 240 degree is in the third quadrant right? That is 270-240=30, the answer -2.
Finally I understand how to find sine cosine of an angle
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Excuse me, why is the hypotenuse always positive at the fourth quadrant(or any other quadrant)? Isn't tangent positive only in in the third quadrant?
so the hypothenuse is always positive because your hypothenuse is your "R" where as your adj is "X" and your opp is "Y"
so much better than my teacher
but now what if it isn’t one of those special triangles
Im having the same issue.
@@jmrc2908 Same. And my exam is tomorrow. Fuck my life.
The www.softschools.com/math/trigonometry/sum_and_difference_of_angles_identities/
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ok guys its 2024 , its been 5 years did any of yall understood this?
What if the denominator is not 3,6, or 4 for the radians. For example, my professor gave me this problem: cos (-9 Pi/ 2). The way he explained it had me really lost but I know the answer is 0... but why?
GOSH HE EXPLAİNS SO WELL
What do you mean by “rationalize it” , what’s wrong if we leave the answer as it is
I should have given this guy my tuition instead because he is the only reason Im able to pass any of my math classes. My professor is literally just there to confuse the hell out of me.
This is actually really simple but I have to do these problems super fast so I won’t be able to take time to draw a graph. I’m just gonna have to memorize..
1:32 it should be positive sqrt of 3, right? the one that is negative is its denominator 2
no
It's like a graph. The bottom is negative
1:23 when should it be negative？
Think of it as a graph. Left side is negative, bottom as well.
How about angles thats not land on special triangle?
Someone explain to me pls isn’t the sin (-135) wouldn’t it be -45
In 8:21, I don't get why you add 8 pie over 4. I'm literally confused
Sir from 3:28 - 4:42 I got the answer as root 3 and I think your answer is wrong because the question is find tan 7 pi/6 not tan pi/6
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why did he use the co terminal for the 4pi/3?
but that's all are for special angle only.how about reference angle other than 45 and 60 ??
Why is the 2 not negative?
1:34 how we know the size of sides?
how about sin 145 sir??
7:26 can someone tell me why 2 is positive even though it's in the same quadrant as 1?
because 2 is the hypotenuse, and it’ll be positive
What if it is 2sin?
Wait, why is 300 degrees associated with 60 degrees for Sin 300?
I have a honours pre calc final tmr I need a 38 on this final exams to pass the class 😂 I have no idea what was going on this whole year despite trying so hard to understand.🤞🤞🤞
Well this definitely cleared up what I'm suppose to do lol
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