$y2-18y-81$
$\left|-9\right|+10-4-8$
$1-49+x^2b^2$
$2x-40>50x+16$
$7-\left(10-5\right)$
$\ln4x=\log3\cdot\log5$
$\cos\left(\frac{5\pi}{6}\right)\cos\left(\frac{\pi}{12}\:\right)+\sin\left(\frac{5\pi}{6}\:\right)\sin\left(\frac{\pi}{12}\:\right)$
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