Question
In Exercises 57-60, use the limit definition of partial derivative to compute the partial derivatives of the functions at the specified points. \begin{aligned} &\text { 60. } f(x, y)=\left\{\begin{array}{ll} \frac{\sin \left(x^{3}+y^{4}\right)}{x^{2}+y^{2}}, & (x, y) \neq(0,0) \\ 0, & (x, y)=(0,0), \end{array}\right.\
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