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let-give-pi-pi-1-prove-that-sin-2-2-1-cos-4cos-4-2-2-solve-inside-C-z-2-2z-sin-2-1-cos-0-find-the-module-and-arg-of-the-roots-

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Question Number 31038 by abdo imad last updated on 02/Mar/18
let give α ∈]−π ,π[ 1)prove that sin^2 α −2(1+cosα) =−4cos^4 ((α/2)) 2)solve inside C z^2 −2z sinα +2(1+cosα)=0 find the module and arg of the roots.
letgiveα∈]−π,π[1)provethatsin2α−2(1+cosα)=−4cos4(α2)2)solveinsideCz2−2zsinα+2(1+cosα)=0findthemoduleandargoftheroots.

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