CASINH

Section: Linux Programmer's Manual (3)
Updated: 2008-08-11
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NAME

casinh, casinhf, casinhl - complex arc sine hyperbolic

SYNOPSIS

#include <complex.h>

double complex casinh(double complex z);
float complex casinhf(float complex z);
long double complex casinhl(long double complex z);

Link with -lm.

DESCRIPTION

The casinh() function calculates the complex arc hyperbolic sine of z. If y = casinh(z), then z = csinh(y). The imaginary part of y is chosen in the interval [-pi/2,pi/2].

One has:


    casinh(z) = clog(z + csqrt(z * z + 1))

VERSIONS

These functions first appeared in glibc in version 2.1.

CONFORMING TO

C99.

COLOPHON

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