$x-5<0$
$\left(11a+7b^4\right)\left(11a-7b^4\right)$
$2\:sen2\left(a\right)+\:sen\left(a\right)=0$
$5x-2y=1$
$x^4+12x^3-64x^2$
$2\left(x+8\right)\left(x-5\right)\ge2x^2+5x$
$6-4r+r^2=\:5$
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