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2. Consider f(x, y, z) = 12 cos(y3 + 2 2). (a) Why do we know that fzyyzer = 0 without doing any computation? (b)

2. Consider f(x, y, z) = 12 cos(y3 + 2 2). (a) Why do we know that fzyyzer = 0 without doing any computation? (b) Do we also know, without doing any computation, that fryzzz = 0? Why or why not

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