$\int\frac{1}{x}-\frac{1}{x^2}+\frac{4}{x^{\frac{2}{3}}}dx$
$\left(2x-1\right)\left(3x+2\right)+\left(4x+3\right)\left(x-2\right)$
$y=e^{-ex}+x^{-e}$
$\int\:\:2\:tan^3x\:dx$
$sen2xsenx$
$\left(4^{-3}\right)^2$
$\lim_{x\to-1}\left(\frac{5x^4+2x^3+9x+6}{x+1}\right)$
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