(a) The function was graphed in Figure 4. Show that f x (0, 0) and f y...

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(a) The function

if (x, y) + (0, 0) ху .2 f(x, y) =- + y? х if (x, y) = (0, 0)

was graphed in Figure 4. Show that fx(0, 0) and fy(0, 0) both exist but f is not differentiable at (0, 0). Use the result of Exercise 45.

(b) Explain why fx and fy are not continuous at (0, 0).

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