Calculus 3: Vector Calculus in 2D (29 of 39) Motion Along a Circle

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In this video I will use the position vector (r) and the derivative of the position vector (r', dr/dt) to describe motion. In this case, it will be the motion around a circle of radius=2.

Next video in the series can be seen at:
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I don't understand why R(t) = 2 sin(t) + 2 cos (t)?

aminerkin