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Exercise

$\int\frac{3\cos\left(4x\right)}{\sin^2\left(4x\right)}dx$
1

Simplify $\frac{3\cos\left(4x\right)}{\sin\left(4x\right)^2}$ into $3\csc\left(4x\right)^2\cos\left(4x\right)$ by applying trigonometric identities

$\int3\csc\left(4x\right)^2\cos\left(4x\right)dx$

Final answer to the exercise

$\int3\csc\left(4x\right)^2\cos\left(4x\right)dx$

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