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Depends on if you're working on 2D vectors or 3D vectors. I'll assume the prior.

Rx = Magnitude * Cos Angle

Ry = Magnitude * Sin Angle

You can work out the Cos and Sin parts by drawing a triangle; in which Cos is Adj/Hyp and Sin is Opp/Hyp. By multiplying by the Hyp (the magnitude) you get the Adj and Opp respectively.

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Q: How do you work out vectors in maths?
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