$sec-\frac{cos}{sin+1}$
$2x=2$
$12^2+36x+27$
$12-170:\left(-2\right)$
$\frac{d}{dx}\left(\sqrt{x^2+y^2}=x-y\right)$
$\frac{x+3}{2x^2-3x-2}$
$5t\:\frac{3m}{s\:}\:1$
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