$\lim_{x\to0}\left(\frac{e^{sen\left(x\right)}-e^{-x}}{sen\left(x\right)-x}\right)$
$12r+5-3r-5$
$\frac{d}{dx}x^5$
$4x-6=2x+10$
$\:\left(ab-2c^2\right)^2$
$5m-m^2+m^3$
$\frac{3x^3-8x^2+6x+8}{x+4}$
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