The difference in the speed of calculating trigonometric functions in Java and C#

I am studying Java and became interested in the work of the method sin (cos). I noticed that the rate of getting the sine on j varies depending on the argument of the function. If the angle is less than 0.785... rad, it calculates quickly, and if it is more than that, it calculates slowly.

Compared with C#, it turned out about the opposite:

Checked in milliseconds for 10 million sine calculations.
Why are the results like this?

Here is the result for java cosine/sine from 0 to 4*pi:

public static void main(String[] args) {        
    long a;
    for (double x = 0; x < 4 * Math.PI; x = x + 0.05) {
        a = System.currentTimeMillis();
        for (int i = 0; i < 10000000; i++) {
            //Math.cos(x);
            Math.sin(x);
        }
        System.out.printf("%.6f, %d \n", x, (System.currentTimeMillis() - a));
    }
}

Here is the result for the cosine/sine of C# from 0 to 4*pi:

public static void Main(string[] args)
    {
        for (double x = 0; x < 4 * Math.PI; x = x + 0.05) {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            for (int i = 0; i < 10000000; i++) {
                Math.Cos(x);
                // Math.Sin(x);
            }
            sw.Stop();
            Console.WriteLine(x +" - " +(sw.ElapsedMilliseconds).ToString());
        }
    }