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Question
Prove the following identity :
`sqrt((1 - cosA)/(1 + cosA)) = sinA/(1 + cosA)`
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Solution
= LHS = `sqrt((1 - cosA)/(1 - cosA))`
= `sqrt((1 - cosA)/(1 + cosA) . (1 + cosA)/(1 + cosA))`
= `sqrt((1 - cos^2A)/(1 + cosA)^2)`
= `sqrt(sin^2A/(1 + cosA)^2)`
= `sinA/(1 + cosA)`
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