A fast and accurate Sin for C#

FastSine.cs

float Sin(float x)
{
    while (x < -3.14159265f)
        x += 6.28318531f;
    while (x > 3.14159265f)
        x -= 6.28318531f;
    float sin;
    var xZ = x < 0 ? -1 : 1;
    sin = 1.27323954f * x - xZ * .405284735f * x * x;
    var sinZ = sin < 0 ? -1 : 1;
    sin = .225f * (sin * sinZ * sin - sin) + sin;
    return sin;
}