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cosh.3m (2010 09)

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c
cosh(3M) cosh(3M)
NAME
cosh( ), coshf( ), coshl( ), coshw( ), coshq( ) - hyperbolic cosine functions
SYNOPSIS
#include <math.h>
double cosh(double x);
float coshf(float x);
HP Integrity Server Only
long double coshl(long double x);
extended coshw(extended x);
quad coshq(quad x);
DESCRIPTION
cosh() returns the hyperbolic cosine of x.
coshf() is a float version of cosh(); it takes a
float argument and returns a float result.
Integrity Server Only
coshl() is a long double version of cosh(); it takes a long double argument and returns a
long double result.
coshw() is an extended version of cosh(); it takes an extended argument and returns an
extended result.
coshq() is equivalent to coshl() on HP-UX systems.
USAGE
To use these functions compile either with the default
-Ae option or with the -Aa
and the
-D_HPUX_SOURCE options.
To use (for Integrity servers)
coshw() or coshq(), compile also with the -fpwidetypes option.
To use any of 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.
For more information, see the HP-UX floating-point guide for HP Integrity servers at the following site:
http://www.hp.com/go/fp
.
RETURN VALUE
cosh(±0) returns 1.
If x is ±INFINITY,
cosh() returns +INFINITY.
If x is NaN,
cosh() returns NaN.
cosh() returns infinity (equal to HUGE_VAL) in lieu of a value whose magnitude is too large, and raise
the overflow and inexact exceptions.
When it raises no other exception, whether
cosh() raises the inexact exception is unspecified.
ERRORS
If the correct value would overflow,
cosh() sets errno to [ERANGE].
Integrity Server Only
HP-UX
libm functions on Integrity servers do not set errno by default. For errno setting, compile
with the +Olibmerrno option.
SEE ALSO
acosh(3M), ccosh(3M), sinh(3M), tanh(3M), math(5).
STANDARDS CONFORMANCE
cosh() : SVID3, XPG4.2, ANSI C, ISO/IEC C99 (including Annex F, ‘‘IEC 60559 floating-point arith-
metic’’)
coshf(), coshl() : ISO/IEC C99 (including Annex F, ‘‘IEC 60559 floating-point arithmetic’’)
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

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