$\sqrt[3]{27}a^4b^5\cdot\sqrt[3]{8a^2}b$
$-7x^2+5x-6$
$\lim_{n\to20}\left(\sin\left(n\pi\right)\right)$
$\lim_{x\to4}\left(\frac{e^4-e^x}{x-4}\right)$
$4x^2-6x=0$
$\int\frac{x}{\left(2-x^2\right)^2}dx$
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