$2x^2-7x-5\le0$
$cos\:\infty\:\left(sec\:\infty-cos\:\infty\right)=sen^2\infty$
$4e^5-2e^3$
$e^y\frac{dx}{dy}-e^{-2y-x}=e^{-x}$
$\lim_{x\to2}\left(\frac{3x^3-x+8}{2x-3}\right)$
$-8t^2+-8t^2$
$\frac{2jw+2}{\left(jw\right)^2+2jw-8}$
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