If , then the expression [√2+√2(1+cos4θ)]is simplified to _________ . 1) 2cosθ 2) 2sinθ 3) -2cosθ 4) -2sinθ (its a single choice question)
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Originally Posted by gkpandey If , then the expression [√2+√2(1+cos4θ)]is simplified to _________ . 1) 2cosθ 2) 2sinθ 3) -2cosθ 4) -2sinθ (its a single choice question) [√2+√2(1+cos4θ)] [√2+√2 . 2cos^2 2θ] [1+cos4θ=2cos^2 2θ , half the angle formula] √2{1+2cos^2 2θ] v2 {1+2(2cos^2 θ-1) v2{2cos^2 θ -1}
Last edited by matsci0000; Sep 4th 2009 at 08:01 AM.
Originally Posted by gkpandey If , then the expression [√2+√2(1+cos4θ)]is simplified to _________ . 1) 2cosθ 2) 2sinθ 3) -2cosθ 4) -2sinθ (its a single choice question) i think your question is √[2+√{2*(1+cos 4θ)}] = ? use identity 1+cos2θ = 2 cos^2 θ and cos4θ =cos2(2θ ) solve the sum to get answer 1) 2cosθ
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