public void TestComputeCosineOf180Degree()
 {
     Assert.Equal(-1.0, AngleMath.CosineOfDegree(180.0), 5);
 }
 public void TestComputeCosineOf90Degree()
 {
     Assert.Equal(0.0, AngleMath.CosineOfDegree(90.0), 5);
 }