Proof Question

Asked by RACHIT_MAHAAN | 19th Sep, 2010, 02:45: PM

Expert Answer:

Use the result 1+cos2θ=2cos2θ repeatedly.Hence 2+2cos8θ=2(1+cos8θ)=2(2cos24θ)=4cos24θ2+2cos8θ=4cos24θ=2cos4θAgain 2+2cos4θ=2(1+cos4θ)=2(2cos22θ)=4cos22θ2+2cos4θ=4cos22θ=2cos2θNow apply again the same result.">

Answered by  | 20th Sep, 2010, 06:05: PM

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