ar ar and Әх" ду ar HINT [See Example 3.] Find az 38 Кх, у, г) x2 + y2 + z2 Әr Әх ar дy Әr Әz Find their values at (0, –1, 1) if possible. (If an answer is undefined, enter UNDEFINED.) Әr "(0, -1, 1) - Әх әr -(0, -1, 1) - ду ar (0,-1, 1) - дz

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