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.

This page is part of release 3.27 of the Linux
man-pages
project.
A description of the project,
and information about reporting bugs,
can be found at
http://www.kernel.org/doc/man-pages/.