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Find the quadratic approximation around (0, 0) for f(x, y) = In(x2 + 2y2 + 1) Find the quadratic approximation around (O, O) for f

Find the quadratic approximation around (0, 0) for f(x, y) = In(x2 + 2y2 + 1)

Find the quadratic approximation around (O, O) for f (x, y) = In(T2 + 2y2 + 1).

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