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sin(2*pi) - not pie - is the same as sin(0) = 0
No.
Do you mean Sin(pi/2) = 1 or [Sin(pi)] /2 = 0.0274....
sin stands for sine cos stands for cosine and tan stands for tangent
The Wikipedia article "Trigonometric identities" lists the following identity (in which I am simply changing variables): cos a sin b = (1/2)[sin(a+b) - sin(a-b)] Here, since the two angles are the same, this simplifies to: cos a sin a = (1/2)[sin(2a) - sin(0)] = (1/2)sin(2a)