128.Prove that : (2sinx)/(1+cosx+sinx)=(1-cosx+sinx)/(1+sinx)

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a = \frac{2 sin x}{1 + cos x + sin x}

\frac{1 - cos x + sin x}{1 + sin x}

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\int \frac{d x}{s i n x + s i n 2 x} =

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