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Example Find the gradient of $\phi$．

$\displaystyle \phi = x^2 z + e^{y/x}$

Answer $\phi = x^2 z + e^{y/x}$. Then

$\displaystyle \nabla \phi = \frac{\partial \phi}{\partial x}\boldsymbol{i} + \f... ...x^2}))\boldsymbol{i} + (e^{y/x}(\frac{1}{x}))\boldsymbol{j} + x^2\boldsymbol{k}$