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Let ax+by+c=0 where a,b,c epsilon R such...

Let `ax+by+c=0` where `a,b,c epsilon R` such that `2a^2 +b^2 + 2c^2 +3ab - 3bc - 5ca = 0,` represent two families of lines concurrent at `A` or `B` then distance `AB` equals

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