$\frac{x^5-x^4+x^2-2}{x^2+1}8$
$\int\frac{x^2-2x-3}{x^3-x^2+x-1}dx$
$16-x^2>0$
$x2\:+\:25x\:+\:96\:\ge75x$
$\left(6u^4+39u^3-18u^2\right)\left(-u\right)$
$t=t^2+20t$
$x^2=-5$
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