$\left(3x+9\right)\left(3x+2\right)$
$s^0t^8u^4s^0t^{-1}u^5s^3t^4u^0$
$\int\left(2t^2+\sqrt{t}-6\right)dt$
$\frac { 12 n ^ { 2 } - 8 n } { 2 n }$
$\int\frac{5}{x^2-2x+4}dx$
$5x^2y+2xy^2+7+3xy^2-2x^2y-1$
$\lim_{x\to9}\left(\frac{x^2-8x-9}{3-\sqrt{x}}\right)$
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