$\int_{-2}^{-1}\left(\frac{1}{x\sqrt{x^2-1}}\right)dx$
$5+-84-1$
$\left(\frac{4x^3}{y^{-2}}\right)^3$
$\int\:\frac{sen\left(x\right)}{\left(cos\left(x\right)\right)^2+1}dx$
$\int_5^{3u-4}dx$
$\left(1.3x-0.9\right)^2$
$\frac{a^4+2}{a^3}$
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