$cos\left(\frac{7\pi}{6}-\frac{\pi}{4}\right)$
$25x^2-300x+900$
$8h+4+10-5$
$\int\:\frac{2x^2-5}{x^4-5x^2+6}dx$
$\left(13x+5\right)\left(13x-\frac{2}{5}\right)$
$\left[4x^2+13x-28\right]>6$
$1\cdot2\cdot\left(-2\right)$
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