1.

इसका मान निकालें: `(1-(2xy)/(x^(2)+y^(2)))-:((x^(3)-y^(3))/(x-y)-3xy)` isA. `1/(x^(2)+y^(2))`B. `1/(x^(2)+y^(2))`C. `1/(x-y)`D. `1/(x+y)`

Answer» Correct Answer - B
`(ab)(1-(2xy)/(x^(2)+y^(2)))-:((x^(3)-y^(3))/(x-y)-3xy)`
`=((x^(2)+y^(2)-2xy)/(x^(2)+y^(2)))-:[(x^(3)-y^(3)-3xy(x-y))/(x-y)]`
`=((x-y)^(2))/(x^(2)+y^(2))-:((x-y)^(3))/(x-y)`
`=((x-y)^(2))/(x^(2)+y^(2))xx1/((x-y)^(2))=1/(x^(2)+y^(2))`


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