$x^2-3x-12<0$
$2\csc2x=\csc^2x\cdot\tan x$
$9=27$
$-|-\left(-8\right)|$
$y'=\frac{x-1}{y^2\:},\:y\left(0\right)=2$
$\left(\frac{-2}{5a^2}\right)^3$
$-\frac{48c^2d^4}{-8cd}$
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