Question

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Answer 1

$(1- frac{2x}{y} + frac{ x^{2} }{y ^{2} } )* frac{y}{(x-y) ^{2} }= frac{ y^{2} -2xy+ x^{2} }{y ^{2} } * frac{y}{(x-y)^{2} } = frac{x ^{2}-2xy+y ^{2} }{y}* frac{1}{(x-y) ^{2} }= frac{(x-y)^{2} }{y}* frac{1}{(x-y) ^{2} } = frac{1}{y}$