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9.2.24  Simplifying and expressing preferentially with cosines

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 sin can be turned into powers of cos. The trigcos command performs these substitutions.

Example

trigcos(sin(x)^4+cos(x)^2+1)
     
cos4xcos2x+2           

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