$\lim_{x\to-\infty}\left(1+e^{-2x}\right)$
$4h^2+8h-5$
$\int2t\cdot\cos\left(n\:wo\:t\right)dt$
$a^4-3a^2+9$
$8-x^3$
$\int\frac{x+43}{x^2-4x-21}dx$
$9x^2-12x-5$
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