$\left(x+\frac{1}{y}\right)\cdot\left(y+\frac{1}{x}\right)^2$
$x^2-12x+27$
$7m^2n\left(-9mn^2\right)$
$5y^2+10y$
$\int\frac{18}{\left(x-1\right)\left(x+4\right)}dx$
$\frac{x^3+6x-2}{x-3}$
$\int\left(\frac{2}{\left(x+7\right)^5}\right)dx$
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