$\left(2x-5\right)^2\le\:1$
$\left(8a+12s+7t+7u\right)^2$
$5a-2b-3a+7b$
$\lim_{x\to3}\left(\frac{3sen^2\left(x-3\right)}{x^2-6x+9}\right)$
$1^2-1^0+1-\left(-1\right)^3$
$\frac{s^4+81}{s\left(s^2+9\right)^2}$
$-\frac{\left(x-14\right)}{x-6}$
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