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nickersia

  • one year ago

Use De Moivre's Theorem to prove the identity:

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  1. nickersia
    • one year ago
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    \[\cos 3\alpha=4\cos ^{3}\alpha-3\cos \alpha\]

  2. nickersia
    • one year ago
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    Anyone?

  3. BSwan
    • one year ago
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    simply De Moivre's Theorem :- \((\cos x+ i \sin x)^n=\cos (nx ) +i \sin(nx) \)

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