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

Answer 1

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

Answer 2

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

Math.cos(Math.toRadians(354))

Answer 3

public static double sin(double a)

Parameters:
a - an angle, in radians.
Returns:
the sine of the argument.

Answer 4

None of the answers fitted my needs. Here's what I had:

A sinus in degree (not radiant). This is how you turn it back into a degree angle:

double angle = Math.toDegree(Math.asin(sinusInDegree));

Explanation: If you have 2 sides of a triangle, it's the only solution that worked for me. You can calcluate everything using the normal degree metric, but you have to convert the Math.asin() back to degree for the right result. :)

Answer 5

You can use this also:

degrees *= Math.PI / 180;
Math.cos(degrees)