$\left(\frac{3}{2}m^2-1\right)\left(\frac{3}{2}m^2+1\right)$
$\frac{7}{t-1}-\frac{14}{t^2-1}$
$ydy=x^2dx$
$cos\left(x\right)-sen^2\left(2x\right)+2sen^2\left(x\right)-1$
$\lim_{x\to-1}\left(\frac{x^2}{x+1}\right)$
$u^2-16u$
$x^4+9x^2$
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