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Exercise

$\int240cos\left(3x\right)sin\left(x\right)dx$
1

Simplify $240\cos\left(3x\right)\sin\left(x\right)$ into $120\sin\left(4x\right)-120\sin\left(2x\right)$ by applying trigonometric identities

$\int\left(120\sin\left(4x\right)-120\sin\left(2x\right)\right)dx$

Final answer to the exercise

$\int\left(120\sin\left(4x\right)-120\sin\left(2x\right)\right)dx$

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