$\int_{-4}^{-1}3-y^2dx$
$x^3+512$
$-1250+-3600$
$\lim_{x\to+1}\left(\frac{2x+3}{x-1}\right)$
$12^2+20^2$
$12j+2j-4+3j^2$
$\frac{x^4+x^2-x-2}{x^3-1}$
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