(a) Write an expression as a limit for the directional derivative of f at (x 0 ,...

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(a) Write an expression as a limit for the directional derivative of f at (x0, y0) in the direction of a unit vector u = (a, b).
How do you interpret it as a rate? How do you interpret it geometrically?
(b) If f is differentiable, write an expression for Duf (x0, y0) in terms of fx and fy.

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