$\int\frac{2x^2-1}{x^2\left(2x^2+4\right)}dx$
$\int\csc\left(x\right)\left(\csc\left(x\right)-\cot\left(x\right)\right)dx$
$9-\left|-4-\left(-6+3\right)-2\right|$
$18.50\left(2\right)$
$4x^3-8x^2\:\:entre\:2x$
$\int se^8ds$
$\left(0.5-xy\right)^3$
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