$20a^2+9a-20$
$4pq^3x\left(-p^2\right)+\frac{2}{3}p^2q^3x\left(p+2p\right)+2pq^3$
$x^2-6x+23$
$x^2+6x+42$
$\int\frac{2}{\left(x+2\right)^3}dx$
$\int\arccsc\frac{c}{z}dc$
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