$\left(4+v\right)\left(16-4v+v^2\right)$
$1^2-5-1$
$\left(2ax^2-5x+1\right)^2$
$\left(x+2\right)^2<x^2-5x+3$
$x^2y'-x^2y=0$
$-x^2+2x+3>0$
$\lim_{x\to3}\left(\frac{x^3-3x^2-3x-9}{x-3}\right)$
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