Suppose (1, 1) is a critical point of a function f with continuous second derivatives. In each
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Suppose (1, 1) is a critical point of a function f with continuous second derivatives. In each case, what can you say about f ?
(a) fxx(1, 1) = 4, fx y(1, 1) = 1, fyy(1, 1) = 2
(b) fxx(1, 1) = 4, fx y(1, 1) = 3, fyy(1, 1) = 2
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