$\left(6\right)\:\left(9\right)+\left(6\right)\left(12\right)+5$
$4x+2x\le16$
$-1-6-4+6-2-7-3-18$
$\left(4y^{-\frac{1}{2}}-\frac{5}{7}x^{-6}\right)^2$
$cosx\tan x\cot=1$
$\frac{1}{b\sqrt{1+b}}-\frac{1}{b}$
$\frac{dy}{dt}=2ty^2$
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