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cosh(), coshf()

Compute the hyperbolic cosine

Synopsis:

#include <math.h>

double cosh( double x );

float coshf( float x );

Arguments:

x

The angle, in radians, for which you want to compute the hyperbolic cosine.

Library:

libm

Use the -l m option to qcc to link against this library.

Description:

These functions compute the hyperbolic cosine (specified in radians) of x. A range error occurs if the magnitude of x is too large.

Returns:

The hyperbolic cosine of x.

If an error occurs, these functions return 0, but this is also a valid mathematical result. If you want to check for errors, set errno to 0, call the function, and then check errno again. These functions don't change errno if no errors occurred.

Examples:

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

int main( void )
{
    printf( "%f\n", cosh(.5) );

    return EXIT_SUCCESS;
}

produces the output:

1.127626

Classification:

ANSI, POSIX 1003.1

See also:

errno, sinh(), tanh()