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`ACOS`

— Arccosine function*Description*:`ACOS(X)`

computes the arccosine of`X`(inverse of`COS(X)`

).*Standard*:- F77 and later
*Class*:- Elemental function
*Syntax*:`RESULT = ACOS(X)`

*Arguments*:-
`X`The type shall be `REAL(*)`

with a magnitude that is less than one. *Return value*:- The return value is of type
`REAL(*)`

and it lies in the range 0 \leq \acos(x) \leq \pi. The kind type parameter is the same 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)`

F77 and later *See also*:- Inverse function: COS