$\left(9a-b\right)\left(9a+b\right)$
$\frac{\left(\infty\right)^{\frac{1}{2}}}{\infty}$
$\lim_{x\to0}\left(5x^2-3\right)$
$\frac{\left(226x^2+422x+197\right)}{\left(x+1\right)^2}$
$\frac{2x+5}{6}=\frac{5x+2}{24}$
$\left(3-\sqrt{a}\right)\left(\sqrt{a}+2\right)$
$sec^2x-3\:sec\left(x\right)=0$
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