$\sqrt{255-144}$
$\lim_{x\to0}\left(\frac{-3sin\left(9x^7\right)}{2x}\right)$
$\lim_{x\to7}\left(\frac{3-\left(x-7\right)}{x^2-49}\right)$
$2\left(b-5\right)+14=5b-3\left(b+8\right)$
$\int_{-2}^2\frac{4x}{2}dx$
$9a^4+25b^2-30a^2b$
$ex^{-x}$
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