atan()Prototype: double atan(double a_tan);Header File: math.h (C) or cmath (C++) Explanation: Acos is used to find the arctangent of a number (give it a tangent value and it will return the angle, in radians corresponding to that value). It accepts all real numbers.
//Example gives the angle corresponding to tangent 10
#include <iostream>
#include <cmath>
int main()
{
cout<<atan(10);
}
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