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If the following integral is satisfied for some relationship between the constants $a , b$ and $c$-

$\displaystyle\int_{-∞}^{∞}\displaystyle\int_{-∞}^{∞} e^{-(ax^{2} + 2bxy + cy^{2})}dxdy = 1$

Find the value of $b^{2} -ac$

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