Final answer to the problem
$\cos\left(2x\right)^{3}$
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Step-by-step Solution
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1
When multiplying exponents with same base you can add the exponents: $\cos\left(2x\right)^2\cos\left(2x\right)$
$\cos\left(2x\right)^{3}$
Final answer to the problem
$\cos\left(2x\right)^{3}$