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The equation of second degree x^(2)+2 sq...

The equation of second degree `x^(2)+2 sqrt(2) x y+2 y^(2)+4 x+4 sqrt(2) y+1=0`represents a pair of parallel lines, then the distance between them is

A

4

B

`4 sqrt(3)`

C

2

D

`2 sqrt(3)`

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The correct Answer is:
C
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