$\lim_{x\to0}\left(\frac{2\:sen\left(2x\right)}{x}\right)$
$\int\left(3x^2\tan\left(4x^3\right)\right)dx$
$-\frac{4}{5}a^2b^2+\frac{2}{3}a^2b^2$
$7x^2+36x+5$
$f\left(t\right)=90-22\ln\left(t+1\right)$
$cos\frac{-\sqrt{3}}{2}$
$\frac{3x^3+2x^2-4}{2x^2+1}$
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