Question: Consider the following equation. f ( x , y ) = y 3 / x , P (1, 2), u = 1/3(2 i + sqrt(5)

Consider the following equation.

f ( x , y ) = y 3 / x ,     P (1, 2),     u = 1/3(2 i + sqrt(5) j)

(b) Evaluate the gradient at the point P .
∇ f (1, 2) =

(c) Find the rate of change of f at P in the direction of the vector u .

D u f (1, 2) =

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