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The radius of circle, the period of revolution, initial position and sense of revolution are indicated in the fig.

y-projection of the radius vector of rotating particle P is: 

(1) $y(t)=-3\cos2\pi t,$ where y in m 

(2) $y(t)=4\sin({\pi t\over2}),$ where y in m

(3) $y(t)=3\cos({3\pi t\over2}),$ where y in m

(4) $y(t)=3\cos({\pi t\over2}),$ where y in m

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