$x^2+x+9=0$
$sin\:x\:\left(1+tan\:x\right)=tan\:x\left(sin\:x+cos\:x\right)$
$a2\:-\:24a\:+\:144$
$\sqrt[1]{81}$
$\lim_{x\to-\infty}\left(\frac{e^x-2}{e^x-1}\right)$
$4\left(y-6x^2\right)dx+9xdy=0$
$\frac { x + 10 } { x + 21 ( x - 5 ) }$
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