$4\cos^2x-2\cos x-2=0$
$trinomio\:\:\:\left(0.5\right)m^2\:+\left(0.9\right)m\:-\:0.2$
$\frac{3}{x}+\frac{2}{x}>1-\frac{4}{x}$
$\sqrt[3]{x^7}-\sqrt{x}+2\sqrt[5]{x^2}$
$\frac{m^3}{4m^8}$
$12x^8-2x^2-30$
$\left(\left(x^2\right)^2-1\right)$
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