$\int220\sec^2\left(x\right)dx$
$\int\frac{x^4+x-1}{x^2+1}dx$
$\frac{7\left(3\right)-9}{\left(3\right)^2-3\left(3\right)+4}$
$\:y=\frac{1}{4}sen2x+2\left(senx\right)$
$4x^4\cdot5x^5$
$\frac{x^n}{\left(n+1\right)\cdot\:\left(n+2\right)}$
$\frac{9x-21x+12}{3-2}$
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