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If the pairs of lines x^(2) - 2nxy -y^(...

If the pairs of lines ` x^(2) - 2nxy -y^(2) =0 and x^(2) - 2mxy -y^(2) =0` are such that one of them represents the bisector of the angles between the other , then a): `(1)/(n) +(1)/(m) =0` b)` (1)/(n) - (1)/(m) =0` c)` nm-1 =0` d)` nm+1=0`

A

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

B

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

C

` nm-1 =0`

D

` nm+1=0`

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The correct Answer is:
D
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