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根據u^3+v^3=(u+v)(u^2+v^2-uv)可得z=x[y-(x^2-y)/2],再對x求偏導,得-3uv
z=x^3-4X^2+2XY-Y^2, dz=(3x^2-8x+2y)dx+(2x-2y)dy.
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