8.55 COS — Cosine function

Description:

COS(X) computes the cosine of X.

Standard:

Fortran 77 and later, has overloads that are GNU extensions

Class:

Elemental function

Syntax:

RESULT = COS(X)

Arguments:

X	The type shall be REAL or COMPLEX.

Return value:

The return value is of the same type and kind as X. The real part of the result is in radians. If X is of the type REAL, the return value lies in the range -1 \leq \cos (x) \leq 1.

Example:

program test_cos
  real :: x = 0.0
  x = cos(x)
end program test_cos

Specific names:

Name	Argument	Return type	Standard
COS(X)	REAL(4) X	REAL(4)	Fortran 77 and later
DCOS(X)	REAL(8) X	REAL(8)	Fortran 77 and later
CCOS(X)	COMPLEX(4) X	COMPLEX(4)	Fortran 77 and later
ZCOS(X)	COMPLEX(8) X	COMPLEX(8)	GNU extension
CDCOS(X)	COMPLEX(8) X	COMPLEX(8)	GNU extension

See also:

Inverse function: ACOS