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(Solved): Verify that \( \frac{\partial^{2} f}{\partial x \partial y}=\frac{\partial^{2} f}{\partial y \part ...
Verify that \( \frac{\partial^{2} f}{\partial x \partial y}=\frac{\partial^{2} f}{\partial y \partial x} \) for \( f(x, y)=3 x^{6} y^{4}-4 x^{5} y^{3} \). \[ \frac{\partial \mathrm{f}}{\partial \mathrm{x}}= \]