$\frac{1}{1+2x}\ge-0.1$
$\sin^2g$
$r^3-2r^2+r$
$100x^2-20xy+y^2$
$w^4+2w^2+9$
$\lim_{n\to\frac{1}{2}}\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$2x^2+8x-7=-2$
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