$\lim_{x\to0}\left(\frac{5x}{\cos\left(x\right)-1}\right)$
$\frac{-1}{2}x+\left(-2\right)=-3x-\left(3\cdot\frac{2}{3}\right)$
$q+q+r-2p-6q+3r+p+5p-8r$
$\left(-2xy2+5xy3\right)\left(2xy2+5xy2\right)$
$\ln\left(x\right)=8$
$\left(x^3+4\:x^2\right)\left(x^3-4x\right)$
$60n^3q^2\:-\:36n^5q^2\:-\:72n^3q^3$
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