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2.21.21  Simplify and express preferentially with cosine : trigcos

trigcos takes as argument an expression containing trigonometric functions.
trigcos simplifies this expression with the formula :
sin(x)2+cos(x)2=1, tan(x)=sin(x)/cos(x) and tries to rewrite the expression only with cosine.
Input :

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

Output :

cos(x)^4-cos(x)^2+2

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