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Xy 2y 2x. (-2x^2)*((-XY)+3y^2) ответ. Y'-2xy=1-2x^2. X2-2x+1. (1-X^2)Y''-XY=2.
(-2x^2)*((-XY)+3y^2) ответ. Y'-2xy=1-2x^2. X2-2x+1. (1-X^2)Y''-XY=2.

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