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Rewrite tan(x) with cos(2x) and sin(2x) : tan2cossin2

tan2cossin2 takes as argument an expression containing trigonometric functions.
tan2cossin2 replaces tan(x) by $\displaystyle {\frac{{1-\cos(2.x)}}{{\sin(2.x)}}}$ , in this expression.
Input :
Output :

giac documentation written by Renée De Graeve and Bernard Parisse