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Find the gradient ∇f and the directional derivative at the point P (1,−1,2) in the direction...

Find the gradient ∇f and the directional derivative at the point P (1,−1,2) in the direction a = (2,−1,1) for the function f (x,y,z) = x^3z − y(x^2) + z^2. In which direction is the directional derivative at P decreasing most rapidly and what is its value?

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