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\int_{0}^{3} x^2-9x+18 dx -\int_{3}^{6} x^2-9x+18 dx+\int_{6}^{8} x^2-9x+18 dx
\int_{0}^{3} x^2-9x+18 dx -\int_{3}^{6} x^2-9x+18 dx+\int_{6}^{8} x^2-9x+18 dx
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