185864…: “Right of the loud solution”

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Find the antiderivative:

\[\int 3\sin (3\theta )\; d\theta .\]

$9\cos (3\theta )+C$ $-\cos (3\theta )+C$ $-9\cos (3\theta )+C$ $\sin (3\theta )+C$ $\cos (3\theta )+C$