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Transform arccos into arctan : acos2atan

acos2atan takes as argument an expression containing inverse trigonometric functions.
acos2atan replaces arccos(x) by $\displaystyle {\frac{{\pi}}{{2}}}$ - arctan($\displaystyle {\frac{{x}}{{\sqrt{1-x2}}}}$), in this expression.
Input :
acos2atan(acos(x))
Output :
pi/2-atan(x/sqrt(1-x^2))



giac documentation written by Renée De Graeve and Bernard Parisse