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If x^(2)+y^(2)=9 and 4a^(2)+9b^(2)=16, ...

If `x^(2)+y^(2)=9 and 4a^(2)+9b^(2)=16`, then maximum value of `4a^(2)x^(2)+9b^(2)y^(2)-12abxy` is :

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