$\int\frac{2x-3}{x^3+4x}dx$
$\int\frac{2x^3+3}{x^3-4x}dx$
$a^2-6a+\frac{4}{2a}$
$\int\:x^2\sqrt{x^3+31}dx$
$\lim_{x\to\infty}\left(5xe^{-5x}\right)$
$2ab+12ba-15xy+6xy-ab+2xy$
$0.2x=5$
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