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### 8.52 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