NAME

catanh, catanhf, catanhl — complex inverse hyperbolic tangent

SYNOPSIS

/* -lm */
#include <complex.h>

double complex
catanh(double complex z);

float complex
catanhf(float complex z);

long double complex
catanhl(long double complex z);

DESCRIPTION

The catanh(), catanhf() and catanhl() functions compute the complex inverse hyperbolic tangent of z.

For all complex floating-point numbers z,

catanh(z) = -i catan(iz).

RETURN VALUES

The catanh(), catanhf() and catanhl() functions return the complex inverse hyperbolic tangent of z with imaginary part in the interval [-Pi/2, Pi/2], and unbounded real part.

SEE ALSO

cacosh(3), casinh(3)

STANDARDS

The catanh(), catanhf() and catanhl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).