$2\sqrt{47}\cdot\frac{\sqrt{3}}{2}$
$\frac{b}{-6}=\:-4$
$\frac{cos}{1-sen}-sec$
$13^3$
$\left(xy^2+x-7\right)dx+\left(y+x^2y-1\right)dy=0$
$x ^ { 4 } - a ^ { 4 }$
$\left(3a-5b-4c\right)^2$
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