$x+x^{-1}=\sqrt{5}$
$\int\:sen^42tdt$
$\int\:\frac{1}{x\sqrt{x^4-4}}dx$
$2\left(-3+7-1\right)$
$3x^2-4x-5$
$\int3sen\left(-8x\right)dx$
$\left(\frac{4}{z}\right)^3$
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