$2x^2-3x^{-2}-5x^2+2x-5$
$-42-\left(-16\right)+9$
$2x^2+8x-12=0$
$\frac{d^2}{dx^2}\left(\frac{y-1}{1-x}\right)$
$y'=y.tgx+\frac{1}{cosx}$
$\left(31x+21\right)^2$
$6\:\left(-3b\:-\:9\right)$
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