$\frac{\left(cos^2\left(x\right)-sin^2\left(x\right)\right)}{1-tan^2x}$
$14m^2-31m-10$
$\frac{7^2}{7^2}$
$\left(3c-2d\right)^2$
$2x+20\le-30$
$s^2-\frac{2}{3}s+\frac{2}{6}$
$232\:-\:5$
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