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( cos ⁡ θ + i sin ⁡ θ ) n = cos ⁡ n θ + i sin ⁡ n θ displaystyle (cos theta +isin theta )^ n =cos ntheta +isin ntheta A time period is a posh number that can be expressed being an integral of an algebraic purpose about an algebraic domain. The periods are a category of numbers which includes, together with the algebraic numbers, several