CASINH(3) Linux Programmer s Manual CASINH(3)

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.


SEE ALSO asinh(3), cabs(3), cimag(3), complex(7)

COLOPHON This page is part of release 3.22 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at

2008-08-11 CASINH(3)