Question

Express cos teetar in terms of tan teetar
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Answer 1

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Express cos theeta in terms of tan theeta

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tana=sina/cosa

square both sides

tan^2a=(1-cos^2a)/cos^2a

tan^ 2 a=(1/cos^2a)-(1)

tan^2a +1=(1/cos^2a)

cosa=1/√[tan^2 a+1]

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