$-10-\left(-2\right)-\left(-9\right)-7$
$\int xd^{-3x}$
$\left(x+2\right)\left(x-4\right)\left(x-6\right)$
$\frac{\sin\:\left(90^{\circ\:}-x\right)}{\tan x}$
$\frac{2}{x-1}-\frac{6}{2x}+1=5$
$2cos2\theta\:=\sqrt{3}$
$\left(x-5\right)\left(-4\right)$
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