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If the two pairs of line x^2 -2mxy -y^2=...

If the two pairs of line `x^2 -2mxy -y^2=0 and x^2 - 2nxy -y^2 = 0` are such that one of them represent the bisector of the angles between the other, then: (A) mn + 1 = 0 (B) mn - 1 = 0 (C) 1/m + 1/n = 0 (D) 1/m -1/n = 0

A

`mn=-1`

B

`mn=1`

C

`(1)/(m)+(1)/(n)=0`

D

`(1)/(m)-(1)/(n)=0`

Text Solution

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The correct Answer is:
A
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