$y'=\frac{4}{x^2-4}$
$4a+3b+11a-8b$
$\left(a^{2x}+a^{x+1}\right)^2$
$x+4=8$
$\left(m-n\right)-\left(m+n\right)$
$-5-x^2$
$2x+8\le x+12$
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