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A conical pendulum consists of a ball attached to a string that moves in a horizontal circle, as shown in the figure above.

Which of the following expressions correctly gives the speed at which the ball is traveling in terms of $l$, $\theta$ and universal constants?

A

$\sqrt {lg}$

B

$\sqrt {lg\sin\theta}$

C

$\sqrt {lg \cos\theta}$

D

$\sqrt {lg\tan\theta}$

E

$\sqrt {lg \sin\theta \tan\theta}$

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