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If y = (2 sin α/(1 + cos α + sin α)), then prove that ((1 - cos α + sin α)/(1 + sin α)) = y

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If y = (2 sin α/(1 + cos α + sin α)), then prove that ((1 - cos α + sin α)/(1 + sin α)) = y 

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To prove 

((1 + sin α - cos α)/(1 + sin α)) = RHS

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