Find a function of two variables f(x,y) for which D = 0, but the function has a minimum. Exclude the trivial functions f(x,y) = constant. Explain why your example has a minimum and show in detail that D = 0 at that minimum.

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# Find a function of two variables f(x,y) for which D = 0, but the

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Find a function of two variables f(x,y) for which D = 0, but the function has a minimum. Exclude the trivial functions f(x,y) = constant. Explain why your example has a minimum and show in detail that D = 0 at that minimum.