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# Malus's Law watch

1. Is the angle for this law meant to be in degrees or radians?
2. (Original post by kkid106)
Is the angle for this law meant to be in degrees or radians?
It doesn't matter but it's normally expressed in degrees. If you use a calculator, just make sure that you set your trig functions to either degrees or radians, whichever you intend to use, before you plug the angle into the cosine.
3. If you calculate the cosine of an angle, you're just finding a number which relates to that particular angle, rather than the way you're describing the angle (i.e. using degrees or radians).
As Stonebridge says, just make sure your calculator is in tune with you and is using the same way of measuring angles.

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