How to use Math.cos() & Math.sin()? [duplicate]

Question

I'm using Math.cos and Math.sin but it returns me unexpected results like these:

 Angle   Sin      Cos
 354     0.8414  -0.5403
 352     0.1411   0.98998
 350    -0.958   -0.2836

Why I get these results?

Answer 1

Are you trying to use degrees? Keep in mind that sin and cos are expecting radians.

Math.cos(Math.toRadians(354))

Answer 2

Math.cos and Math.sin take angles in radians, not degrees. So you can use:

double angleInDegree = 354;
double angleInRadian = Math.toRadians(angleInDegree);
double cos = Math.cos(angleInRadian); // cos = 0.9945218953682733