设函数;=arctan(xy)+2x2+y,求dz.
设函数;=arctan(xy)+2x2+y,求dz.
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3、设方程y=sin(xy)+3确定了函数y=f(x),求曲线y=f(x)在点(0,3)处的切线斜率
设函数;=arctan(xy)+2x2+y,求dz.