casinh man page

casinh, casinhf, casinhl — complex arc sine hyperbolic


#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.


These functions calculate 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))


These functions first appeared in glibc in version 2.1.


For an explanation of the terms used in this section, see attributes(7).

Interface Attribute Value
casinh(), casinhf(), casinhl() Thread safety MT-Safe

Conforming to

C99, POSIX.1-2001, POSIX.1-2008.

See Also

asinh(3), cabs(3), cimag(3), csinh(3), complex(7)


This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at

Referenced By

asinh(3), complex(7), csinh(3).

The man pages casinhf(3) and casinhl(3) are aliases of casinh(3).

2015-04-19 Linux Programmer's Manual