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2.21.10  Transform arctan into arcsin : atan2asin

atan2asin takes as argument an expression containing inverse trigonometric functions. atan2asin replaces arctan(x) by arcsin(x/√1+x2), in this expression.
Input :

atan2asin(atan(x))

Output :

asin(x/sqrt(1+x^2))

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