$\frac{1}{\left(x+3\right)\left(x-3\right)}$
$-3x+2=-1$
$35\cdot0.25$
$\left(x-3\right)^2-\left(x+2\right)^2$
$\left(3y^2-2x+1\right)+\left(2x^2+2x+4\right)$
$\lim_{x\to\infty}\left(\frac{x^2-x-2}{x-5}\right)$
$\int\frac{2x+7}{x^{2}-4}dx$
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