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

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

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

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