e ^ { ( x ^ { 2 } + y ^ { 3 } ) / 2 \delta ^ { 2 } } d x d y = 2
Solve for d
d=\sqrt{\frac{2}{xy}}e^{-\frac{\delta ^{2}\left(x^{2}+y^{3}\right)}{4}}
d=-\sqrt{\frac{2}{xy}}e^{-\frac{\delta ^{2}\left(x^{2}+y^{3}\right)}{4}}\text{, }\left(y>0\text{ and }x>0\right)\text{ or }\left(x<0\text{ and }y<0\right)
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