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



NAME
       cosh, coshf, coshl - hyperbolic cosine function

SYNOPSIS
       #include <&lt;math.h>&gt;

       double cosh(double x);
       float coshf(float x);
       long double coshl(long double x);

       Link with -lm.

DESCRIPTION
       The  cosh()  function  returns  the  hyperbolic  cosine  of x, which is
       defined mathematically as:

           cosh(x) = (exp(x) + exp(-x)) / 2

CONFORMING TO
       SVr4, POSIX, 4.3BSD, C99.  The float and the long double  variants  are
       C99 requirements.

SEE ALSO
       acosh(3), asinh(3), atanh(3), ccos(3), sinh(3), tanh(3)

COLOPHON
       This  page  is  part of release 3.05 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/.



                                  2007-12-26                           COSH(3)