NAME

cacosh, cacoshf, cacoshl — complex inverse hyperbolic cosine

SYNOPSIS

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

double complex
cacosh(double complex z);

float complex
cacoshf(float complex z);

long double complex
cacoshl(long double complex z);

DESCRIPTION

The cacosh(), cacoshf() and cacoshl() functions compute the complex inverse hyperbolic cosine of z.

For all complex floating-point numbers z,

cacosh(z) = i acos(z).

RETURN VALUES

The cacosh(), cacoshf() and cacoshl() functions return the complex inverse hyperbolic cosine of z with imaginary part in the interval [-Pi, Pi], and non-negative real part.

SEE ALSO

casinh(3), catanh(3)

STANDARDS

The cacosh(), cacoshf() and cacoshl() functions conform to ISO/IEC 9899:1999 (“ISO C99”).