| atanh | Function (ROM Call 0x289*)

math.h, timath.h

float atanh (float x);

Floating point hyperbolic area tangent.

atanh returns the hyperbolic area tangent of floating point argument x. The hyperbolic area tangent is defined as log((1+x)/(1-x))/2.
Note: atanh will return NAN if x is smaller than -1 or greater than 1. Also, it will return POSITIVE_INF if x is 1, and NEGATIVE_INF if x is -1.

Uses: fabs, is_transfinite, sqrt, TIOS_abs, _bcd_math
Used by: catan