1.

If the angle between the lines respresented by 2x^2+5xy+3y^2+6x+7y+4=0 is tan^(-1)(m) and a^2+b^2-ab-a-b+1le0, then 2a+3b=

Answer»

`1//3`
m
`-m`
`m^2`

ANSWER :A


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