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Suppose you have two circles, one with radius r1 centered at the origin, and one with radius r2 centered at (r1 + r2 ; 0). Thus, the circles have the point P = (r1 ; 0) in common. Suppose the circle with radius r2 begins rolling counterclockwise along the outside of the other circle. As the circle rotates, the point that was originally at P will also rotate, tracing out a path in the plane. Find parametric equations for this path. Anybody that gets this right I will fan and medal!

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