For each of the following functions, First compute the gradient function, and plot it at several points. Then, using your graph, match the function with the plot of its gradient. Click on a graph to make it larger. ? 1. f(x, y) = 2xy ? ? ? 2. f(x, y) = 3x - 5y 3. f(x, y) = x² - y² 4. f(x, y) = x² + y²

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