$a\:+\:3a,\:a\:=\:2$
$a2\:-30+225$
$4\infty$
$\int_{-\infty}^{-64}\left(\frac{1}{1+x^2}\right)dx$
$4,78-0,9+0,007$
$m^4-12m^2n+36n^2$
$\int\frac{1+x^2}{x\left(5x^2+2x-5\right)}dx$
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