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Use De Moivre’s Theorem to show cos(3θ) = 4 cos^3 θ - 3 cos θ Hence, obtain...

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Advance Math

Use De Moivre’s Theorem to show

cos(3θ) = 4 cos^3 θ - 3 cos θ

Hence, obtain all solutions of x for the following equation

3x 4x^3 = 1.

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