$a^3+a+30$
$\left(18\right):6x\left(-2\right)$
$\lim_{x\to\infty\:}\left(\frac{2e^t-2}{t}\right)$
$\lim_{x\to0}\left(\frac{cos\left(tanx\right)-cosx}{x^4}\right)$
$\frac{\left(\sin\left(2x\right)\right)}{1-\cos\left(2x\right)}$
$2a-b+3a\left(2a-b\right)$
$4^1$
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