$\left(-2x-4\right)-\left(5x+8\right)$
$36r^2-84r+49$
$\left(-w+3\right)\left(-w-7\right)$
$\lim_{x\to+\infty}\left(\frac{x^3+3x^2+x^4+1}{x+x^5-3}\right)$
$16x^2-40xy$
$cotx+\frac{1}{cotx\:}=\frac{\left(\left(cotx\right)^2+1\right)}{\left(cotx\right)^2}$
$\lim_{x\to\infty}\left(\frac{2e^x-\ln\left(x\right)}{e^x-4x+2}\right)$
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