$x^4+12x^3-64x^2=0$
$2-\left(3-5\left(2+5\right)-1\right)$
$n^2-18n+10$
$x^2+8x-3=0$
$\frac{sen\:z\:}{1+cos\:z}+\frac{1+cos\:z}{sen\:z}=2cs$
$30\cdot0.5$
$xe7x\:$
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