18.) Compute the directional derivative of f in the given ✓ given points P. 3 a) f(x, y, z) = xy² + y ² z ²³ + Z²x₁₂ P = (4-2₂³¹1), V = 1 Ju (i +3j + 2k) (1 12 3 b.] f(x, y, z) = xyz, P = (e₁e₁0), V= 13₂ | +istisk 13 to

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