$\left(a+3\right)\left(a+5\right)$
$4r-r$
$\left(x+2\right)^2\left(x+4\right)^2-2\left(x+3\right)^2$
$\int\frac{16}{x^3\sqrt{x^2-16}}dx$
$\lim_{x\to0}\left(\frac{4x+1}{x\left(x-3\right)^2}\right)$
$-3x^2+9x=-810$
$5,49+12,531+8,9$
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