where 
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and 
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Evaluate the definite integrals as limit of sums$\int\limits_{\begin{smallmatrix} 1\\ \end{smallmatrix}}^{4}{{}}$ (x^2-x)dx
Evaluate the definite integrals as limit of sums$\int\limits_{\begin{smallmatrix} 1\\ \end{smallmatrix}}^{4}{{}}$ (x^2-x)dx