$\frac{-5x+2}{2}\le0$
$\frac{6}{x^2-2x-8}$
$29\:-\:\left(-53\right)$
$-6+2-9$
$144\:and\:-144$
$36v^2-30v+121$
$\frac{sen^3z+cos^3z}{sen\:z+cos\:z}=1-sen\:z\:cos\:z$
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