1.

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 bisectors of the angles between the other, then

Answer»

`(1)/(N)+(1)/(m)=0`
`(1)/(n)-(1)/(m)=0`
NM - 1 = 0
mn + 1 = 0

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