$\left(4-7\right)\cdot\left(9-11\right)$
$xy=x^2+x+y$
$\lim_{x\to0}\left(\frac{e^x}{2^x}\right)$
$5c^2-39c+25=c^2+2c-75$
$\left(2p^2q\right)^3$
$\lim_{x\to20}\left(\cot\left(x\right)\right)$
$-x^3-x^2-57\cdot x-369$
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