Trig Integration
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Which expression is equal to \( \int \sin ^2 3 x \,d x \text { ? }\)
\(\dfrac{1}{2}\left(x-\dfrac{1}{6} \sin 6 x\right)+C\)
\(\dfrac{1}{2}\left(x+\dfrac{1}{6} \sin 6 x\right)+C\)
\(\dfrac{1}{2}\left(x-\dfrac{1}{3} \sin 3 x\right)+C\)
\(\dfrac{1}{2}\left(x+\dfrac{1}{3} \sin 3 x\right)+C\)
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