$\sqrt[3]{81x^2y^4}$
$\left(4x^4y^{-3}\right)\:\left(8x^{-1}y^{-3}\right)$
$\lim_{x\to0}\left(\frac{1}{sen\left(x\right)}-\frac{1}{e^x-1}\right)$
$3x^2+4x>1$
$-7s+-s^2+-7s_{5s}$
$z+395=700$
$\frac{1-x}{1-\sqrt{x}}$
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