$\frac{1}{1+2x}\ge-0.1$
$4+-5+-1+-8$
$\left(x+9\right)^2=x^2+\:+81$
$\int x\left(\sqrt{x}-3\right)dx$
$\frac{3u^3v^4}{4u^2v^{-2}}$
$x^2-5.6x$
$6sec^2xtanx=8tanx$
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