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f(x,y,z) = xey+z. (a) Find the gradient of f, ∇f. (b) Find the directional derivative of...

f(x,y,z) = xey+z.

(a) Find the gradient of f, ∇f.

(b) Find the directional derivative of f at the point (2, 1, 2) in the direction of ? = 3? + 4?.

Math   Calculus   
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