7.6 ACOS — Arccosine function

Description:

ACOS(X) computes the arccosine of X (inverse of COS(X)).

Standard:

Fortran 77 and later

Class:

Elemental function

Syntax:

RESULT = ACOS(X)

Arguments:

X	The type shall be REAL with a magnitude that is less than or equal to one.

Return value:

The return value is of type REAL and it lies in the range 0 \leq \acos(x) \leq \pi. The return value if of the same kind as X.

Example:

          program test_acos
            real(8) :: x = 0.866_8
            x = acos(x)
          end program test_acos
     

Specific names:

Name	Argument	Return type	Standard
DACOS(X)	REAL(8) X	REAL(8)	Fortran 77 and later

See also:

Inverse function: COS