HP-UX Reference (11i v1 05/09) - 3 Library Functions A-M (vol 6)

cosh(3M) cosh(3M)

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 speci-

fying -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

cosh() fails, errno is set to the following value.

[ERANGE] The correct value would overﬂow.