\( \frac{x dx}{e^{x^2}} + \frac{dy}{y^3} = 0\)
\( \int{\frac{x dx}{e^{x^2}}} +\int{ \frac{dy}{y^3}} = \int{0}\)
\( -\frac{e^{-x^2}}{2} - \frac{1}{2y^2} = c \)
\( e^{-x^2} +y^{-2} = c \)