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``\frac {(\Pi t)}{2}``, where y in m
(3) y(t) = 3 cos``\frac {(3\Pi t)}{2}``, where y in m
(4)3 cos``\frac {(\Pi t)}{2}``, where y in m