[tex] \int\limits^a_b {x} \, dx [/tex]x²dx

[tex] \int\limits^a_b {x} \, dx =\frac{x^2}{2}|^a_b=\frac{a^2-b^2}{2}[/tex]
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[tex]\int\limits^a_b {x^2} \,dx=\frac{x^3}{3} |^a_b=\frac{a^3-b^3}{3}[/tex]