text 66 find the value of d x partial z text at the point 1 1 3 text i
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defines x as a function of the two independent variables y and z and the partial derivative exists. Exercises 67 and 68 are about the triangle shown here. \text {
66. Find the value of } d x / \partial z \text { at the point }(1,-1,-3) \text { if the equation } x z+y \ln x-x^{2}+4=0