$25x^2-10xy+y^2$
$\int\frac{x^2+19x+10}{2x^2+5x}dx$
$x^2-10x+21<0$
$\left[\left(\sqrt{x}+1\right)\left(\sqrt{x}-1\right)\right]^2\:-\left(x^2-4x\right)-1$
$x^2-9<0$
$4r+\left(-3r\right)$
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