$\lim_{x\to0}tgx$
$12m^3n+72mn^4$
$\left(\left(\left(2^2\right)^3\right)^4\right)^5.\:2^6^3$
$\left(\frac{cos2x}{sen2x}\right)^2+tan^245^{\circ}$
$\frac{d}{dx}\left(cos\left(x^2\right)\right)$
$x-2x-x+4$
$25y^2+20y-5$
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