$\int xe^{-9x}dx$
$\int\left(\frac{z}{\sqrt{z}+1}\right)dz$
$\frac{x^{18}-y^{12}}{x^3-y^2}$
$\left(4x^4y^3a^4-2x^3y^5a^6\right)^2$
$9x^2-24x+16=0$
$\frac{s^4+81}{s\left(s^2+9\right)^2}$
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