$\lim_{x\to1}\left(3x^2+17x-1\right)$
$\int3\sec^2\left(2t\right)dt$
$\int\frac{a}{1+x^2}dx$
$\frac{sin4\theta\:+sin8\theta\:}{sin4\theta\:-sin8\theta\:}$
$\frac{5\sqrt{8}}{2}$
$312.5-254.2$
$r^2+9r+6+0r^{-1}\cdot r-3$
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