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Знайти частинні похідні першого порядку функції z(x,y)=x^3+y^3-3xy .
z'_x=3x^2-3y , z'_y=3x^2-3y .
z'_x=3x^2-3y , z'_y=3y^2-3x .
z'_x=3y^2-3x , z'_y=3x^2-3y .
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