$\lim\:_{t\to\:0}\left(e^ti+\frac{sent}{t}j+e^{-t}k\right)$
$x^9+2x^2-x-2$
$x2-8x=8$
$\left(a^5\right)^5$
$\left(-5w\right)\left(4w\right)$
$25+-1+12$
$\int\frac{x^2+x-1}{x^3-+2x^2+x}dx$
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