$\frac{4x^2-1}{2x+1}$
$-20x^2+600x-4000>0$
$z^2+2z+5$
$p^3\:+\:8$
$6x+3<57$
$\frac{d}{dx}\left(x^x\right)=x^{4\cos\left(x\right)}$
$2\left(\frac{\pi}{2}\right)$
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