$\left(a-1\right)^2+2\left(a-1\right)-1$
$\left(10b-5\right)^2$
$4\:x\:-\:5\:<\:7$
$-12+1+-10$
$-22n-15+18n$
$4\sec^2-3\:=\:1\:+\:4\tan^2$
$\lim_{x\to\infty}\frac{1}{\left(x-1\right)\left(x+2\right)}$
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