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By using de Moivre's Theorem, prove thatcos5? = 16 cos?? - 20cos? + 5 cos?Hence find all the roots of the equation48x? - 60x +

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By using de Moivre's Theorem, prove thatcos5? = 16 cos?? - 20cos³? + 5 cos?Hence find all the roots of the equation48x? - 60x³ + 15x + 2 = 0.

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