This function computes the inverse hyperbolic tangent of x.
Return Value
The inverse hyperbolic tangent of x. If the the value of
x is plus or minus 1, the return value is an Inf with the
same sign as the argument x, and errno is set to
ERANGE. If the absolute value of x is greater than 1, the
return value is NaN and errno is set to EDOM.
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