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2.21.7  Transform arccos into arctan : acos2atan

acos2atan takes as argument an expression containing inverse trigonometric functions.
acos2atan replaces arccos(x) by π/2−arctan(x/√1−x2), in this expression.
Input :

acos2atan(acos(x))

Output :

pi/2-atan(x/sqrt(1-x^2))

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