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If one of the pair of lines ax^2+2hxy+by...

If one of the pair of lines `ax^2+2hxy+by^2=0` bisects the angle between coordinate axes in positive quadrant, then

A

`a+b=2|h|`

B

`a+b=-2h`

C

`a-b=2|h|`

D

`(a-b)^2=4h^2`

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The correct Answer is:
B
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