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  4. If x2+y2=9 4 a2+9 b2=16, then maximum value of 4 a2 x2+9 b2 y2-12 a b x y is -

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Q. If $x^2+y^2=9 \& 4 a^2+9 b^2=16$, then maximum value of $4 a^2 x^2+9 b^2 y^2-12 a b x y$ is -

Trigonometric Functions

Solution:

Correct answer is (d) 144