$\left(\frac{2}{1}-\frac{1}{u}\right)$
$\lim_{x\to0}\frac{\tan\left(2x\right)}{\tan\left(\pi x\right)}$
$series\frac{\left(5x^2\right)}{4-x}$
$\frac{6-2x}{3}<1$
$-10nm+7nm$
$\int3x^2\left(2x^6-9\right)dx$
$2x-12\le13-3x$
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