1.

If the pair of straight lines given by A x^(2) + 2 H xy + By^(2) = 0 (H^(2) gt AB) forms an equilateral triangle with line ax + by + c = 0 then (A + 3 B) ( 3 A + B) is equal to

Answer»

`H^(2)`
`- H^(2)`
`2 H^(2)`
`4 H^(2)`

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