Given a / b = 1 / 3, calculate the value of a & sup2-2ab-b & sup2 / A & sup2-3ab + B & sup2

a/b=1/3,
b=3a
Original formula = (a ^ 2-6a ^ 2-9a ^ 2) / (a ^ 2-9a ^ 2 + 9A ^ 2)
=(1-6-9)/(1-9+9)
=-14

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