Find af ?х af ду af дz af af 7 Әх ду ах af = = ду af = af дz f(x, y, z) = 3xy + 3xz - 3yz Find their values at (0, -1, 1) if possible. (If an answer is undefined, enter UNDEFINED.) af and -(0, -1, 1) = -(0, -1, 1) = 00

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