$49x^2-70xy+10^2$
$\int_{-\pi}^{-\frac{\pi}{2}}\left(\frac{4\left(x+\pi^2\right)}{\pi^2}\right)dx$
$-13=\frac{r}{9}+8$
$2.5^3$
$\sqrt{0.4}$
$-2r^2+12r+74=0$
$\int\frac{4x}{x^2+2}dx$
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