how to calculate trigonometric values in c++
*
* C++ Program to Illustrate Trigonometric functions
*/
#include <iostream>
#include <iomanip>
#include <cmath>
const double PI = 3.14159265;
int main()
{
double degrees, radians;
std::cout << "Enter angle in degrees ";
std::cin >> degrees;
// Trigonometric functions accept angles in radians
radians = degrees * PI / 180.0;
std::cout << "Value of trigonometric ratios " << std::endl;
std::cout << "cos(radians) = " << std::setprecision(3)
<< cos(radians) << std::endl;
std::cout << "sin(radians) = " << std::setprecision(3)
<< sin(radians) << std::endl;
std::cout << "tan(radians) = " << std::setprecision(3)
<< tan(radians) << std::endl;
return 0;
}