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The equation of second degree x^2 + 2sqr...

The equation of second degree `x^2 + 2sqrt2 xy + 2y^2 + 4x + 4 sqrt2 y + 1 = 0` represents a pair of straight lines, the distance between them is :

A

2

B

`2 sqrt 3`

C

4

D

`4 sqrt 3`

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The correct Answer is:
A
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