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2.21.13  Transform tan(x) into sin(x)/cos(x) : tan2sincos

tan2sincos takes as argument an expression containing trigonometric functions.
tan2sincos replaces tan(x) by sin(x)/cos(x), in this expression.
Input :

tan2sincos(tan(2*x))

Output :

sin(2*x)/cos(2*x)

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