$5x^2+8x-11=3-5x$
$\left(x+4\right)\left(2x-1\right)$
$\left(\frac{2a}{\left(3ab\right)^2}\right)^3$
$\cos2x=\cos x$
$5x^2-50x+30=0$
$\lim_{x\to0}\left(\sqrt{x^2+x}\sqrt{x^2-x}\right)$
$\left(2m^3\right)^{-2}\:.\:-2m^{-2}$
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