$4b\:+\:8b$
$\lim_{x\to0}\frac{\cot\left(3x\right)}{\cot\left(2x\right)}$
$\lim_{x\to\infty}\left(\frac{2x^2\cdot e^{-x}}{1}\right)$
$\frac{x}{x^3-2x^2+x}$
$\left(\frac{d}{2}-4\right)^2$
$w=x\sin y$
$22x+33n-11m$
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