expand (x/y - y/x) ^2
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(x/y - y/x) ^2
(x^2-y^2/xy) ^2
x^4-y^4/(xy)^2
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Answer:
(x/y-y/x)^2
= (x/y)^2-2 (x/y)(y/x)+(y/x)^2
= x^2/y^2-2+y^2/x^2.
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