$p^2+6p+7$
$cot^2x-tan^2x=0$
$2x^2-10x+8$
$x^2+x+6\le0$
$-9+1024-16-1+64$
$\left(x^2-x\right)e^x$
$\lim_{x\to1}\left(\left(1-x\right)\tan\left(\frac{\pi}{2}x\right)\right)$
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