$\frac{x^2-169}{x-13}$
$\frac{12x^3+15x^2-6x}{3}$
$\frac{sin^4x}{2}+\:\frac{cos^4x}{3\:}\:=\:\frac{1}{5}$
$x\:3\:+\:x\:5\:-\:x\:7$
$\left|-2\:\:\:\:\:1\right|\:\cdot\left|5\:\:2\:\:\right|\:\cdot\:21$
$xy^2=16$
$0.13\cdot3$
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