$\frac{d}{dx}\ln\frac{x^2}{1+x^2}$
$4\left(x+6\right)<6\left(x-3\right)$
$h-5\ge1$
$1-a^{10}$
$\int_a^{x^2}\left(sen^3\left(t\right)\right)dt$
$\int b^xdx$
$225b^2-a^2b^2$
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