Question

How to use cos() function to get the cosine of an angle of N radians in C++

Answer 1

#include <iostream>
#include <cmath>

using namespace std;

int main()
{
	cout << "cos(-1) = " << cos(-1) << endl;
	cout << "cos(1) = " << cos(1) << endl;
	cout << "cos(0) = " << cos(0) << endl;
	cout << "cos(-0) = " << cos(-0) << endl;
	cout << "cos(0.9) = " << cos(0.9) << endl;
	cout << "cos(3.141593 / 3) = " << cos(3.141593 / 3) << endl;
	cout << "cos(3.141593 / 2) = " << cos(3.141593 / 2) << endl;

	return 0;
}


/*
run:

cos(-1) = 0.540302
cos(1) = 0.540302
cos(0) = 1
cos(-0) = 1
cos(0.9) = 0.62161
cos(3.141593 / 3) = 0.5
cos(3.141593 / 2) = -1.73205e-07

*/

 

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