(v)cos theta(tan theta+2)(2tan theta+1)=2sec theta+5sin theta x

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Prove the following identity: cos theta(tan theta+2)(2tan theta+1)=2sec theta+5sin theta

Prove that cos theta (tan theta +2) (2tan theta +1) = 2 sec theta + 5 sin theta

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(sin theta tan theta)/(1-cos theta)=1+sec theta

Prove that : (sec theta-tan theta)/(sec theta+tan theta)= 1-2 sec theta tan theta+ 2 tan^2 theta .

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Prove that :(cos theta-sin theta)/(cos theta+sin theta)=sec2 theta-tan2 theta

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