1. For Parts (a) (b), use the contour diagram for f shown to the right to estimate the directional derivative of f(x, y) in the direction i at the given point. Make it clear how you obtained your estimate. 5 4 1 3 2 7 1 8 1 2 3 4 5 (a) ở = ỉ at (1,1) (b) ở = ỉ at (3, 1)

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