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The area of the parallelogram formed by ...

The area of the parallelogram formed by the lines `y=m x ,y=x m+1,y=n x ,a n dy=n x+1` equals.

A

`(|m+n|)/(m-n)^2`

B

`2/(|m+n|)`

C

`1/(|m+n|)`

D

`1/(|m-n|)` .

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