$-4^2+6x+9$
$\frac{d}{dx}5tan^5$
$m^2+7m+49$
$\frac{25m^2-36n^4}{5m+6n^2}$
$\log x+\log\left(x+3\right)=1$
$\frac{1}{4}l\:\frac{18}{8}$
$m^2+12m+19=0$
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