Problem

Expand the expression cos⁡(3x) using the triple-angle formula.

Answer

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Answer

Therefore, the expansion of cos⁡(3x) will be 4cos3⁡(x)−3cos⁡(x).

Steps

Step 1 ：We know that the triple-angle formula for cosine is cos⁡(3x)=4cos3⁡(x)−3cos⁡(x).

Step 2 ：Therefore, the expansion of cos⁡(3x) will be 4cos3⁡(x)−3cos⁡(x).

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