$\lim_{x\to3}\left(\frac{2^{x-3}}{x-3}\right)$
$\left(b+c\right)\left(b+c\right)$
$\frac{x^4+3x^3-2}{x^2+2x-1}$
$\int\left(\frac{9}{8+9x}\right)dx$
$\cos^{-1}\left(\frac{4356}{2464}\right)$
$\left(x+6\right)-\left(2x\\:+7\\:\right)-\\:3x\\:=\\:-9$
$\frac{x-2}{x^2-4x}$
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