$\lim_{x\to0}\left(\frac{5x}{\tan\left(x\right)}\right)$
$3^1$
$-4+\left(-6+1\right)+3-\left[3+\left(1-2\right)+2\right]+1-7$
$-4x+5x\:x\:$
$\int\:cot^{-1}\:4t\:dt$
$\frac{dq}{dt}+\frac{2}{10+2t}q=4\:\:\:\:,\:\:\:\:q\left(2\right)=100$
$\sqrt{11a^3b}$
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