$x^2-4x-9$
$4\cos^2\left(x\right)-3$
$27\cdot27\cdot27$
$4^3\cdot2^3\cdot2^{-4}$
$184k^2-312k+54=0$
$\frac{2^8}{2^0}$
$\lim_{x\to0}\left(1-sqrt\left(x^2+x\right)\right)$
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