$\int\sqrt{\frac{\left(x^2-4\right)}{x^2}}dx$
$2.651^2$
$-2x+\frac{8}{4}x+\frac{1}{4}x+x-\frac{5}{6}x$
$\left(8x\:+\:4\right)\:^2$
$tana=\frac{sena}{cosa}$
$y'-y=1$
$y-y^2=y^2-3$
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