Step-by-step Solution

Simplify the trigonometric expression $\left(12\cos\left(3x\right)+6\cos\left(3x\right)^2+\cos\left(3x\right)^3\right)^2$

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Step-by-step explanation

Problem to solve:

$\left(12\cos\left(3x\right)+6\cos\left(3x\right)^2+\cos\left(3x\right)^3\right)^2$

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Problem Analysis