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  3. 1. (a) find the directional derivative of f at (2,

1. (a) Find the directional derivative of f at (2,1) in the direction from (2,1) to...

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Basic Math

1. (a) Find the directional derivative of f at (2,1) in thedirection from (2,1) to (6,-2). Show your work clearly.

(b) Find a unit vector u such that the directional derivative off in the direction of u at (2,1) is zero. Show all work required tojustify your answer.

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