$\lim_{x\to\infty}\left(-x^2+4x-1\right)$
$1-10x+50x^2<1$
$9cos^2x=-10cosx-1$
$\frac{-3}{5}x+\frac{1}{3}=\frac{7}{9}x-1,\hat{3}$
$25m^2-20m+4$
$4x+10x$
$\frac{-3x^7}{-9x^4}$
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