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Consider the function f(x,y) = ( x2 + z2)ln(y) a)Find the gradient of f. b) Find...

Consider the function f(x,y) = ( x2 + z2)ln(y)

a)Find the gradient of f.

b) Find the rate of change of f at the point (2, 1, 1) in the direction of ?⃗ = 〈−2, 4, −4〉

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