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प्रश्न
Find the squares of the following:
`(7x)/(9y) - (9y)/(7x)`
योग
उत्तर
`((7x)/(9y) - (9y)/(7x))^2`
= `((7x)/(9y))^2 + 2((7x)/(9y))((9y)/(7x)) + ((9y)/(7x))^2`
= `(49x^2)/(81y^2) + 2 + (81y^2)/(49x^2)`.
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