$\lim_{x\to0}\left(\frac{2x^3}{1-sen\left(x\right)}\right)$
$\lim_{x\to1}\left(\frac{x^2-1}{sin\left(x-1\right)}\right)$
$-999\:+\:100$
$\int7x\left(5x+4\right)^2dx$
$8n-4mn+4n-3mn+5m-24mn-2mn-12mn-m$
$\frac{2tan\theta\:}{1+tan^2\theta\:}=sen2\theta\:$
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