$-ab\left(2a-3b\right)$
$3\sin^2\frac{\pi}{12}+3\cos^2\frac{\pi}{12}$
$\frac{2}{x^2+3x+2}$
$\frac{1+\cos x}{cot\:x}=\tan x+sin\:x$
$-\left(-8\right)\cdot\left(-11\right)+\left(-3\right)\cdot\left(-15\right)-6\cdot\left(-20\right)$
$9\:-\:9\:x\:2$
$4\cdot7+2\cdot6$
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