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Does cos⁡(3t)=3cos⁡3t−3cos⁡t\cos (3 t)=3 \cos ^{3} t-3 \cos t

Question 65

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Does cos⁡(3t)=3cos⁡3t−3cos⁡t\cos (3 t)=3 \cos ^{3} t-3 \cos t ?

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