Degrees	Radians
0	0
90	0.5*PI
180	PI
270	1.5*PI
360	2*PI

cos()

document.write(Math.cos(Math.PI));

The Math.cos() method is useful in animation applications. If an object A revolves around object B in a constant-radius orbit, its y location can be derived by multiplying the orbiting radius by the cosine of the angle that the radius makes with the upright ray.

acos()

document.write(Math.acos(-1));

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