$\frac{x^4-2x^3+x-7}{x^2-1}$
$\frac{d}{dx}\left(\frac{\left(x^3\left(x-2\right)^2\right)}{\left(x^2+9\right)^9}\right)$
$\frac{5^{n}}{5^{n}}$
$4\cdot18$
$\frac{x^{-1}\cdot\:x^{-1}}{x^{-7}}$
$-7\ge3-2x$
$\int9\cdot x\cdot\sec^2\left(3\cdot x\right)dx$
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