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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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