$\int\frac{2x}{x^2+2x+2}dx$
$48,1+0,0001-0,01$
$\frac{\left(-69\right)}{23}$
$4e^3+2e^5$
$\left(5pq-\:5\right)\:\left(5pq\:-\:7\right)$
$6^{15}\:.\:6^2$
$\frac{25-36n^4}{5-6n^2}$
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