$\frac{4x}{3}+\frac{2}{9}<\frac{5x}{3}+\frac{x}{2}+\frac{5}{18}$
$\ln\left(2x\right)+\ln\left(2x^2\right)$
$\sqrt{x^2}-9$
$sec\:0.6435$
$4\:+\:-28\:+\:-3\:=\:$
$-4x^2y\:x\:-2xy^2$
$\lim_{x\to0}\left(1+\frac{1}{\sqrt{x}}\right)^x$
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