$\frac{x^4+x^2+2}{x^2+2}$
$2\left(1-3w+w\left(w-6\left(2w-5\right)+4\right)-2w^2\right)$
$5-x\ge-2$
$3cosx=2sen^2x$
$3x+4>-3x-2$
$\left(x-4\right)\left(x-1\right)\left(x+2\right)\left(x-3\right)$
$x^2y^3+2;\:x=1;\:y=-5$
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