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As mentioned in a comment, you are trying to take the derivative of a logical equation, not of a function. f = x^2 - 2 * 3^(1/2) x y + 3 y^2 - 8 * 3^(1/2) x - 8 y; D[f, {x, 2}] (* 2 *) Correct. g = x^2 - 2 * 3^(1/2) x y + 3 y^2 - 8 * 3^(1/2) x - 8 y == 0; D[g, {x, 2}] (* False *) A "derivative" of a logical expression. If you must retain your ...



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