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The distance between the pair of paralle...

The distance between the pair of parallel lines`x^(2) + 2xy + y^(2) - 8ax - 8ay - 9a^(2) = 0` is... 

A

`2sqrt5a`

B

`sqrt10 a`

C

`10 a`

D

`5sqrt2 a`

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The correct Answer is:
D
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