$\lim_{n\to4}\left(\frac{8sin\left(\pi\cdot n\right)}{\pi\cdot\left(n^2-16\right)}\right)$
$\frac{ds}{dt}s=\left(6-t\right)\left(2+t^2\right)^{-1}$
$\lim_{x\to a}\left(\frac{\sqrt{x-6}-\sqrt{a-6}}{x-a}\right)$
$512+27a^9$
$1.5\sin\left(2x\right)-\cos\left(x\right)-\frac{1}{6}=0$
$\frac{3x+2}{4}=\frac{x+4}{2}$
$\int18t^8e^{-t^9}dt$
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