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2.21.11  Transform arctan into arccos : atan2acos

atan2acos takes as argument an expression containing inverse trigonometric functions.
atan2acos replaces arctan(x) by π/2−arccos(x/√1+x2), in this expression.
Input :

atan2acos(atan(x))

Output :

pi/2-acos(x/sqrt(1+x^2))

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