$6x^2-42x+5$
$\left(2x^{-1}\right)^2$
$\frac{4\cos1}{2}x$
$\frac{dx}{dy}+x=x+ye^{y+2}$
$\lim_{x\to0}\left(\frac{x+\tan\left(x\right)}{5+\sin\left(x\right)}\right)$
$\frac{3}{\left(x-5\right)\left(x-2\right)}$
$\left(4ax\:+\:5\right)\:\left(ax\:-\:4\right)$
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