$\lim\:_{t\to\:0}\left(e^ti+\frac{sent}{t}j+e^{-t}k\right)$
$-34-91-22-7$
$\frac{x^8}{5^4}$
$8\sqrt{2}x^{4-15}$
$\left(2am-3am^2\right)^2$
$9\cos^2x-4$
$\frac{1-a^2b^4c^8}{1-ab^2c^4}$
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