To convert trigonometric angles in Radians, multiply by Math.PI/180. This will convert degrees to radians.
The following is the code −
Example
using System;
class Program {
static void Main() {
Console.WriteLine(Math.Cos(45));
double res = Math.Cos(Math.PI * 45 / 180.0);
Console.WriteLine(res);
}
}Above, we converted using the following formulae −
Math.PI * angle / 180.0