$\lim_{x\to-\infty}\left(\frac{e^{-x}}{\sqrt{x}}\right)$
$2cos^2x-cosx-1$
$n^2-3n-304=0$
$\left(3y^3\right)^4\left(4y^2\right)^{-3}$
$3-\csc^2\left(\frac{\frac{\pi}{4}}{2}\right)$
$mercury$
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