NAME
cosh(), coshf() — hyperbolic cosine functions
SYNOPSIS
#include <math.h>
double cosh(double x);
float coshf(float x);
DESCRIPTION
The
cosh()
function returns the hyperbolic cosine of its argument.
The
coshf()
function is a
float
version of
cosh();
it takes a
float
argument and returns a
float
result.
To use this function, compile either with the default
-Ae
option or with the
-Aa
and
-D_HPUX_SOURCE
options.
The
coshf()
function is not specified by any standard, but
it is named in accordance with the conventions
specified in the "Future Library Directions" section of the
ANSI C standard.
To use these functions, make sure your program includes
<math.h>,
and link in the math library by specifying
-lm
on the compiler or linker command line.
RETURN VALUE
If
x
is ±INFINITY,
cosh()
returns +INFINITY.
If
x
is NaN,
cosh()
returns NaN.
If the correct value would overflow,
cosh()
returns
HUGE_VAL
and sets
errno
to [ERANGE].
ERRORS
If
cosh()
fails,
errno
is set to the following value.
- [ERANGE]
The correct value would overflow.
STANDARDS CONFORMANCE
cosh(): SVID3, XPG4.2, ANSI C
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