[tex]\bf \displaystyle \int (7x^2+2x^{-2})dx\implies \int 7x^2\cdot dx+ \int 2x^{-2}\cdot dx
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\displaystyle 7\int x^2\cdot dx+ 2\int x^{-2}\cdot dx\implies 7\cdot \cfrac{x^3}{3}+2\cdot \cfrac{x^{-1}}{-1}\implies \cfrac{7x^3}{3}-\cfrac{2}{x}+C[/tex]