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Prove that the parallelogram formed by t...

Prove that the parallelogram formed by the straight lines :
`(x)/(a)+(y)/(b)=1`, `(x)/(b)+(y)/(a)=1`, `(x)/(a)+(y)/(b)=2` and `(x)/(b)+(y)/(a)=2` is a rhombus.

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