$-x^2+8x+9$
$\left(9-t\right)^2$
$\sqrt{25}-\:x^2$
$5\left(10a+1\right)+2\left(2+8a\right)$
$1+x^{10}-2x^5$
$-\frac{1}{2}x^2y^2+x^3-2x^3+\frac{2}{5}xy$
$\frac{d}{dx}\left(y^5+xy^2=24\right)$
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