A geometric proof of the sum formula of sine: sin(a+b)=sin(a)cos(b)+sin(b)cos(a)
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- čas přidán 28. 07. 2023
- A geometric proof of the sum formula of sine: sin(a+b)=sin(a)cos(b)+sin(b)cos(a). We will show the geometric meaning of both sides and prove the identity with the area of triangles and the similarity of triangles.
