Final answer to the problem
$16x\sin\left(x\right)\cos\left(x\right)^2\cos\left(4x\right)$
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Step-by-step Solution
Specify the solving method
1
Multiply $8$ times $2$
$16x\sin\left(x\right)\cos\left(x\right)\cos\left(x\right)\cos\left(4x\right)$
2
When multiplying two powers that have the same base ($\cos\left(x\right)$), you can add the exponents
$16x\sin\left(x\right)\cos\left(x\right)^2\cos\left(4x\right)$
Final answer to the problem
$16x\sin\left(x\right)\cos\left(x\right)^2\cos\left(4x\right)$