$\frac{4x^5+2x^3+6x^2-8}{4x^2+2}$
$2x^3si\:x\:es\:3$
$0.58-0.23$
$\left(3x^9-9y^6\right)^2$
$-8csc^2x-8cotx=-14$
$\sqrt{\left(\sqrt{13}+2\sqrt{2}\right)\left(\sqrt{13}-2\sqrt{2}\right)-4}$
$\frac{-19x^2+6x^3+20}{x^2-2x-3}$
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