Transform arccos into arctan : acos2atan

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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