$\frac{-2x^5+8x^4+2x^2}{-2x^3}$
$\infty\:+\infty\:^2$
$2x^2+9x+10=0$
$\tan^2x=2$
$8-4\cdot2-1$
$49s^2+154s+121$
$\frac{dy}{dx}=2x^2\left(7+y\right)$
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