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if one of the lines the pair ax^2+2hxy+b...

if one of the lines the pair `ax^2+2hxy+by^2=0` bisects the angle between positive directions of the axes , then a, b, h, satisfy the relation

A

`a+b=2|h|`

B

`a+b=-2h`

C

`a-b=2|h|`

D

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

Text Solution

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The correct Answer is:
B
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