$cos12x=0.5$
$4x^2-\left(x+2\right)^2-3$
$6x^{2\:}+23x+20=0$
$\frac{d}{dx}x^2\ln x^2$
$m^2+n^2=25$
$\int\frac{x^2}{\sqrt{\left(x+2\right)^2-9}}dx$
$x^2+33x-200$
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