acos()
Prototype: double acos(double a_cos);
Header File: math.h (C) or cmath (C++)
Explanation: Acos is used to find the arccosine of a number (give it a cosine
value and it will return the angle, in radians corresponding to that value).
It must be passed an argument between -1 and 1.
//Example gives the angle corresponding to cosine .5
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
cout<<acos(.5);
}
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