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Exercise

$\int4cos\left(4x\right)cos\left(9x\right)dx$
1

Simplify $4\cos\left(4x\right)\cos\left(9x\right)$ into $2\cos\left(13x\right)+2\cos\left(5x\right)$ by applying trigonometric identities

$\int\left(2\cos\left(13x\right)+2\cos\left(5x\right)\right)dx$

Final answer to the exercise

$\int\left(2\cos\left(13x\right)+2\cos\left(5x\right)\right)dx$

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$\frac{675}{225}$

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$r2\:=\:100$
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