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  3. by using de moivre's theorem, prove thatcos5? = 16

By using de Moivre's Theorem, prove thatcos5? = 16 cos?? - 20cos? + 5...

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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 + 15x + 2 = 0.

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