Скачать или смотреть PROOF OF cos4θ USING THE DE MOIVRE'S THEOREM

De Moivre's theorem helps us raise power and find the roots of complex numbers in trigonometric form. Let's say we have z=r(cos⁡θ+isin⁡θ), according to De Moivre's theorem, we can easily raise z to the power of n.

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