$x^3-\:2x^2+\:1\:sobre\:x^2-\:x$
$\lim_{k\to\infty}\left(\frac{-4^k}{7^k}\right)$
$3\times50^{0}-2x$
$7x+4-2x-3$
$\csc^2\left(x\right)-\cot^2\left(b\right)=1$
$2\cos^2\left(\frac{x}{3}\right)-1$
$\int_{-1}^8\frac{1}{\sqrt[3]{x}}dx$
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