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integral: limit as n\toinfinity of sum _(i=1)^n l(5(x_i^*)^2 - 3(x_i^*)^3r)Delta x sobre [0,2]
integral: limit as n\toinfinity of sum _(i=1)^n l(5(x_i^*)^2 - 3(x_i^*)^3r)Delta x sobre [0,2]
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