$\int\:\frac{1-x}{x^3+x}dx$
$-x^2-2x^2+5x-2$
$50a+12b+4b+10a-8b+100ae$
$\frac{3}{x+1}=\frac{9}{4x+5}$
$\left(z-5^2\right)$
$2=\sec\left(x\right)+\sec^2\left(x\right)$
$\int senxsec\left(cost\right)^3dx$
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