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\int -4 to 0 (x^2-2x) dx + \int 0 to 2 (2x-x^2) dx + \int 2 to 3 (x^2-2x) dx
\int -4 to 0 (x^2-2x) dx + \int 0 to 2 (2x-x^2) dx + \int 2 to 3 (x^2-2x) dx
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