## 9.3.3 ACOS (X)

Description: | Produces the arccosine of X.
Class: | Elemental function; Generic
Arguments: | X must be of type real. The |X| must be less than or equal to 1.
Results: | The result type is the same as X and is expressed in radians. The value lies in the range 0 to pi.

Specific Name | Argument Type | Result Type
--- | --- | ---
ACOS | REAL(4) | REAL(4)
DACOS | REAL(8) | REAL(8)
QACOS | REAL(16) | REAL(16)

Examples

ACOS (0.68032123) has the value .8225955.

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