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6.23.23  Simplifying and expressing preferentially with sines: trigsin

Any trigonometric function can be written in terms of sins and coss, and with the identity sin(x)2+cos(x)2=1, the even powers of cos can be turned into powers of sin. The trigsin command performs these substitutions.


Example.
Input:

trigsin(sin(x)^4+cos(x)^2+1)

Output:

sin4x−sin2x+2

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