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Question Number 103481 by mohammad17 last updated on 15/Jul/20
provethat(cosnθ5+isin2nθ10)5−1einθ=2sin(nθ)?
Answered by Dwaipayan Shikari last updated on 15/Jul/20
enθi−e−inθ=2sin(nθ)(enθ5i)5=enθi{cosnθ+isinnθ−cosnθ+isinnθ=2isinnθ
Commented by mohammad17 last updated on 15/Jul/20
thankyousir
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