$\int\frac{cose}{sen^2e}de$
$\frac{d}{dx}\:y^2-4x^5+6xy-6x=6$
$\frac{3x^2-2x+4}{x-2}$
$7b-15\le\:\:\:5b-3$
$\int\left(\sqrt{1-s}\right)ds$
$y^2-2y+6$
$1-\sqrt{xy}$
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