Consider the function f(T,y)= kr - 2xy + y?. %3D 1. Show that (0, 0) is a critical point of f(T, y). 2. Determine the values of k (if any) for which the critical point at (0, 0) would be each of the following: i: A local maximum ii, A local minimum iii. A saddle point iv. Unclassifiable (the second derivative test is inconclusive)

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