C++ Programming/Code/Standard C Library/Functions/acos

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acos[edit]
Syntax
#include <cmath>
double acos( double arg );

The acos() function returns the arc cosine of arg, which will be in the range [0, pi]. arg should be between -1 and 1. If arg is outside this range, acos() returns NAN and raises a floating-point exception.

Related topics
asin - atan - atan2 - cos - cosh - sin - sinh - tan - tanh