$\frac{729-216x^9}{9-6x^3}$
$\frac{500}{\left(q+1\right)}=\left(16+2q\right)$
$1+x-x^2\:yz-x^3\:yz$
$3m+2n+5m-7n$
$\frac{\left(1-p\right)^2}{p}=4$
$\int ctg^2csec^3\left(x\right)dx$
$\frac{dy}{dx}=-\frac{3x^2+6xy}{3x^2+2y}$
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