Returns a value in the range 0 to , which is the arc cosine of its
radian argument.
Format
#include <math.h>
double acos (double x);
Argument
- x
- A radian expressed as a real value.
Description
When abs(x) is greater than 1.0, the value of
acos(x) is 0 and the acos function sets errno to EDOM.
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