$4-30-2-2+5$
$36a^2-48a+16$
$\left(w-2\right)-1$
$\lim_{h\to0}\left(\frac{\sqrt{2\left(x+h\right)+1}-\sqrt{2x+1}}{h}\right)$
$-11\cdot23$
$\left(2x+y\right)^2-\:\left(2x-y\right)^2$
$\left(-m+2\right)^2$
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