Question: 3. Given function f(x, y, z) = x+y + z, find the direction in which decreases most rapidly at point (2, -3,6). What is

3. Given function f(x, y, z) = x+y + z, find the direction in which decreases most rapidly at point (2, -3,6). What is the directional derivative in this direction? (12 points)

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