Even and Odd Functions

Even functions: f(-x) = f(x) e.g. \cos\theta

Odd functions: f(-x) = -f(x) e.g. \sin\theta

See also wikipedia

This explains why in the previous post:

D\sin (x^2-1)=2x\cos(1-x^2)=2x\cos(x^2-1)

Find out what this function looks like using Wolfram|Alpha (click this link)!

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