$-2r\:=\:16$
$-9x^2-6x-5$
$\int2\left(2+x^2\right)^{\frac{3}{2}}x\:dx$
$\frac{ctg}{tan}=ctg^2$
$\int\frac{x+3}{5+4x-x^2}dx$
$\left(4a-c\right)^3$
$\frac{x^8-3x+5}{x-1}$
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