$2cos^2\left(x\right)-3cos\left(x\right)-2=0$
$\lim_{x\to0}\left(2+e^x\right)^{e^{-x}}$
$-4x^2+12x-9\le0$
$\frac{2x^{-2}}{2x^3}$
$9x^2-54x+729$
$\left(s-5\right)\left(s-15\right)$
$\left(a^x-a^y\right)^3$
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