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. 

coshf() is a float version of cosh(); it takes a float argument and returns a float result.  To use this function, compile either with the −Ae option or with the −Aa and −D_HPUX_SOURCE options.  Otherwise, the compiler promotes the float argument to double, and the function returns incorrect results. 

coshf() 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, 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. 

SEE ALSO

sinh(3M), tanh(3M), isinf(3M), isnan(3M). 

STANDARDS CONFORMANCE

cosh(): SVID3, XPG4.2, ANSI C

Hewlett-Packard Company  —  HP-UX Release 10.20:  July 1996