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| Normal @ Series[(x - y)^2, {x, x0, 1}, {y, y0, 1}] // Expand 2 x x0 - x0^2 - 2 x y + 2 y y0 - y0^2 ((x - y)^2 /. {x -> x0, y -> y0}) + ((D[(x - y)^2, {{x, y}}]) /. {x -> x0, y -> y0}).{x - x0, y - y0}... |