Question: 4. (18 points) Take ay) : 3:6 + y2. a) Find the directional derivative of f at the point (1.. 2) in the direction of

4. (18 points) Take ay) : 3:6 + y2. a) Find the directional derivative of f at the point (1.. 2) in the direction of the vector (1.. 1). h) In which direction does f increase most rapidly at the point (1.2) '? c) Find a parametric description of the line tangent to the level curve of f at the point (1,2)

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