8.55 COSH — Hyperbolic cosine function

Description:

COSH(X) computes the hyperbolic cosine of X.

Standard:

Fortran 77 and later, for a complex argument Fortran 2008 or later

Class:

Elemental function

Syntax:

X = COSH(X)

Arguments:

X	The type shall be REAL or COMPLEX.

Return value:

The return value has same type and kind as X. If X is complex, the imaginary part of the result is in radians. If X is REAL, the return value has a lower bound of one, \cosh (x) \geq 1.

Example:

          program test_cosh
            real(8) :: x = 1.0_8
            x = cosh(x)
          end program test_cosh

Specific names:

Name	Argument	Return type	Standard
COSH(X)	REAL(4) X	REAL(4)	Fortran 77 and later
DCOSH(X)	REAL(8) X	REAL(8)	Fortran 77 and later

See also:

Inverse function: ACOSH