Question: Problem 5. Plot level curves for the function f(x,y)=xy at heights -1,0, and 1. Plot grad(f) at the points (1,0),(0,1), and (1,-1).

Problem 5. Plot level curves for the function f(x,y)=xy at heights -1,0, and 1. Plot grad(f) at the points (1,0),(0,1), and (1,-1).

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