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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) = $\displaystyle {\frac{{\sin(x)}}{{\cos(x)}}}$ 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



giac documentation written by Renée De Graeve and Bernard Parisse