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Solve the Problem cos⁡3x=cos⁡3x−3sin⁡2xcos⁡x\cos 3 x = \cos ^ { 3 } x - 3 \sin ^ { 2 } x \cos x

Question 308

Essay

Solve the problem.
- cos⁡3x=cos⁡3x−3sin⁡2xcos⁡x\cos 3 x = \cos ^ { 3 } x - 3 \sin ^ { 2 } x \cos x

Correct Answer:

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\[\begin{array} { l }
\cos 3 x = \cos (...

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