cosh

cosh

Compute the Hyperbolic Cosine

Portability: ISO/ANSI C conforming, UNIX compatible

SYNOPSIS
DESCRIPTION
RETURN VALUE
DIAGNOSTICS
EXAMPLE
RELATED FUNCTIONS
SEE ALSO

SYNOPSIS

#include <math.h>

double cosh(double x);

DESCRIPTION

cosh computes the hyperbolic cosine of its argument x , as expressed by the following relation:

[IMAGE]

RETURN VALUE

cosh returns the value of the hyperbolic cosine of the argument x , provided that this value is defined and computable. The return value is a double-precision, floating-point number.

DIAGNOSTICS

For x with an absolute value too large to be represented, the function returns HUGE_VAL . The run-time library writes an error message to stderr (the standard error file).

If an error occurs in cosh , the _matherr routine is called. You can supply your own version of _matherr to suppress the diagnostic message or modify the value returned.

EXAMPLE

This example computes the hyperbolic secant of a number using cosh :

#include <math.h>
#include <stdio.h>

#define VALUE 3.76182

main()
{
   double secant_h;

      /* The hyperbolic secant of VALUE is 1 divided  */
      /* by the hyperbolic cosine of VALUE.           */
   secant_h = 1 / cosh(VALUE);

   printf("1 / cosh(%f) = %f\n", VALUE, secant_h);
}

RELATED FUNCTIONS

sinh , tanh , _matherr

SEE ALSO

Mathematical Functions

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