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If equations ax^2+bx+c=0 and 4x^2+5x+6=0...

If equations `ax^2+bx+c=0 and 4x^2+5x+6=0` have a comon root, where a,b,c are the sides of `/_\ ABC` opposite to angles A,B,C respectively, then 2a= (A) c (B) 2c (C) 3c (D) 4c

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