$x:-2$
$\frac{d^2}{dx^2}\left(\frac{\left(x-1\right)}{x+1}\right)$
$3x^2-6x+3=3\left(x-1\right)^2$
$cos\left(x\right)^2-sec\left(x\right)^2+1$
$14m^2+1=6m^2+7m$
$\sqrt{xz}$
$2x^2-50\ge0$
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