Transform arccos into arcsin : acos2asin

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Transform arccos into arcsin : `acos2asin`

acos2asin takes as argument an expression containing inverse trigonometric functions.
acos2asin replaces arccos(x) by $\displaystyle {\frac{{\pi}}{{2}}}$ - arcsin(x), in this expression.
Input :

acos2asin(acos(x)+asin(x))

Output after simplification :

pi/2

giac documentation written by Renée De Graeve and Bernard Parisse