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HP-UX 11i Version 3: February 2007

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cosh(), coshf(), coshl(), coshw(), coshq() — hyperbolic cosine functions


#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);


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.


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.


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.


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.


cosh() : SVID3, XPG4.2, ANSI C, ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

coshf(), coshl() : ISO/IEC C99 (including Annex F, ``IEC 60559 floating-point arithmetic'')

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