NAME

cosh — hyperbolic cosine function

SYNOPSIS

#include <math.h>

double cosh(double x);

DESCRIPTION

The cosh() function computes the hyperbolic cosine of x .

An application wishing to check for error situations should set errno to 0 before calling cosh(). If errno is non-zero on return, or the returned value is NaN, an error has occurred.

RETURN VALUE

Upon successful completion, cosh() returns the hyperbolic cosine of x .

If the result would cause an overflow, HUGE_VAL is returned and errno is set to [ERANGE].

If x is NaN, NaN is returned and errno may be set to [EDOM].

ERRORS

The cosh() function will fail if:

[ERANGE]

The result would cause an overflow.

The cosh() function may fail if:

[EDOM]

The value of x is NaN.

No other errors will occur.

EXAMPLES

None.

APPLICATION USAGE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

acosh(3) , isnan(3) , sinh(3) , tanh(3) , <math.h> .

DERIVATION

Derived from Issue 1 of the SVID.