1.

If the pair of lines ax^(2)+2hxy+by^(2)=0 (h^(2) gt ab) orms an equilateral triangle with the line lr + my + n = 0 then (a+3b)(3a+b)=

Answer»

`h^(2)`
`2h^(2)`
`3h^(2)`
`4H^(2)`

Answer :D


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