$\lim_{x\to2}\left(\frac{\sqrt{x+2}}{x-4}\right)$
$\cos\left(a\right)\left(1+\sec\left(a\right)\right)\cot\left(a\right)=\text{sen}\left(a\right)$
$y^'=\frac{y^2}{x^3}$
$\frac{x-y}{x+y}-1>0$
$\:\left(1-t\right)^{-0.2}$
$\frac{1}{t}=\frac{v'}{-nv}$
$25\left(2x+1\right)^2-36\left(-5x+2\right)^2$
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