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anonymous
 one year ago
Use De Moivre's Theorem to prove the identity:
anonymous
 one year ago
Use De Moivre's Theorem to prove the identity:

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\cos 3\alpha=4\cos ^{3}\alpha3\cos \alpha\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0simply De Moivre's Theorem : \((\cos x+ i \sin x)^n=\cos (nx ) +i \sin(nx) \)
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