2.If tax=(siny-cosy)/(siny+cosy),then prove that: siny+cosy=2cosx

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1 - \frac{{sin}^{2} y}{1 + cos y} + \frac{1 + cos y}{sin y} - \frac{sin y}{1 - cos y} =

1 - \frac{S i n^{2} y}{1 + C o s y} + \frac{1 + C o s y}{S i n y} - \frac{S i n y}{1 - C o s y} = . . . . . . . .

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The value of the expression $1 - \frac{s i n^{2} y}{1 + c o s y} + \frac{1 + c o s y}{s i n y} - \frac{s i n y}{1 - c o s y}$

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