.\" Copyright 2002 Walter Harms (walter.harms@informatik.uni-oldenburg.de) .\" .\" SPDX-License-Identifier: GPL-1.0-or-later .\" .TH ccosh 3 2024-05-02 "Linux man-pages 6.8" .SH NAME ccosh, ccoshf, ccoshl \- complex hyperbolic cosine .SH LIBRARY Math library .RI ( libm ", " \-lm ) .SH SYNOPSIS .nf .B #include .P .BI "double complex ccosh(double complex " z ); .BI "float complex ccoshf(float complex " z ); .BI "long double complex ccoshl(long double complex " z ); .fi .SH DESCRIPTION These functions calculate the complex hyperbolic cosine of .IR z . .P The complex hyperbolic cosine function is defined as: .P .in +4n .EX ccosh(z) = (exp(z)+exp(\-z))/2 .EE .in .SH STANDARDS C11, POSIX.1-2008. .SH HISTORY glibc 2.1. C99, POSIX.1-2001. .SH SEE ALSO .BR cabs (3), .BR cacosh (3), .BR csinh (3), .BR ctanh (3), .BR complex (7)