$5x\le0$
$1400+85$
$\tan\left(x\right)\sin^2\left(x\right)-\tan\left(x\right)$
$16+12-31-72+125+9$
$15x+x$
$\frac{1}{\left(x-1\right)\left(x^2-4\right)}$
$\left(2x+n-9\right)\left(2x-n-9\right)$
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