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Calculate the second-order partial derivatives. = -108 fyy = 0 xy = -108 (9y2+ 1) 2 fxx = 1 , fxx fyy fyy =

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Calculate the second-order partial derivatives. = -108 fyy = 0 xy = -108 (9y2+ 1) 2 fxx = 1 , fxx fyy fyy = 2 arctan(3 y), xy = -108 (9y2+ 1) 2 f (x, y) = 2 x arctan(3 y) x -1 , fyy fyy = 6 xy = -108 xy (9y2+ 1) 2 -1 fyy = 6 (9 Y2 + l) f) = fix = o, n = -108 xy (9y2+ None of these.

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