ACOS - arccos function.

(ANSI Standard)

Usage:

#include <math.h>
y = acos( x );

Where:

double x, y;
 

Description:

"acos" returns the arccos of its argument (in the range 0 to pi). If the argument is outside the range [-1,1], "acos" returns zero and sets "errno" to EDOM.

See Also:

expl c lib errno

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