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Find the Laplace transform of $-2\cos 3t$.

A

$\displaystyle \cfrac{s}{s^2+9}$

B

$\displaystyle \cfrac{-2s}{s^2+9}$

C

$\displaystyle \cfrac{s}{s^2-9}$

D

$\displaystyle \cfrac{-2s}{s^2+9}$

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