The GNU Fortran Compiler: COSD

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### 9.74 `COSD` — Cosine function, degrees

Description:

  `COSD(X)` computes the cosine of X in degrees.

  This function is for compatibility only and should be avoided in favor of standard constructs wherever possible.

Standard:

  GNU Extension, enabled with `-fdec-math`.

Class:

  Elemental function

Syntax:

  `RESULT = COSD(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 degrees. If X is of the type `REAL`, the return value lies in the range -1 \leq \cosd (x) \leq 1.

Example:

      program test_cosd
        real :: x = 0.0
        x = cosd(x)
      end program test_cosd

Specific names:

  Name | Argument | Return type | Standard
  `COSD(X)` | `REAL(4) X` | `REAL(4)` | GNU Extension
  `DCOSD(X)` | `REAL(8) X` | `REAL(8)` | GNU Extension
  `CCOSD(X)` | `COMPLEX(4) X` | `COMPLEX(4)` | GNU Extension
  `ZCOSD(X)` | `COMPLEX(8) X` | `COMPLEX(8)` | GNU extension
  `CDCOSD(X)` | `COMPLEX(8) X` | `COMPLEX(8)` | GNU extension

See also:

  Inverse function: ACOSD Radians function: COS