$\frac{2tdq}{dt}+\frac{q}{lnt}=0$
$( 7 x + 4 ) ^ { 2 }$
$m^2-12m+8$
$2-\left(18+-3\right)$
$\lim_{x\to0}\left(\frac{2-\left(1+2x\right)\:ln\left(1+2x\right)}{3x^3+x}\right)$
$\cos\left(x\right)\cot\left(\frac{x}{2}\right)-\cot\left(\frac{x}{2}\right)$
$-4\sqrt{x}+\frac{\sqrt{x}^3}{2}$
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