Find the exact length of the polar curve.

r = 3 sin theta

dr/dtheta = 3 cos theta

r^{2}+(dr/dtheta)^{2} = 3^{2} sin ^{2} theta+ 3^{2} cos ^{2} theta = 9

ds = √9 d theta

ds = 3 d theta

s = 3 * pi/4 = 3/4 pi

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