Use de Moivre’s theorem with n = 4 to prove that cos(4θ) = 8 cos^4 (θ) − 8 cos^2 (θ) + 1
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Use de Moivre’s theorem with n = 4 to prove that
cos(4θ) = 8 cos^4 (θ) − 8 cos^2 (θ) + 1
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