3. (10%) Find dy/dx for the equation $xy^3 + (2y)^2 - 5y = \frac{(x^2 - 9)}{\sqrt{x^2 + 2}}$.
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3. (10%) Find dy/dx for the equation $xy^3 + (2y)^2 - 5y = \frac{(x^2 - 9)}{\sqrt{x^2 + 2}}$.