$\lim_{x\to2}\left(\frac{\sqrt{2-x}}{2x-4}\right)$
$2x+1\:+\:2x-1\:area$
$\frac{x^{-2}}{-2}$
$\int e^{2u}du$
$+3-5+6-7+3-7+4-5-9$
$3\left(a-4\right)^2$
$10a^2b^3c^4-15a^5b^2c^4+30a^3b^3c^22$
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