$\frac{d}{dx}\left(7x^{-x}\right)$
$\frac{\left(3x-1\right)}{x^2+1}\le1$
$-2<4x+4$
$5x\left(x-1\right)-2\left(2x^2-7x\right)=-8$
$\frac{s+5}{\left(s+1\right)\left(s^2+1\right)}$
$\int\frac{9}{\left(5-2x\right)^9}dx$
$\frac{dy}{dx}=\frac{5}{x+40}-\frac{4x}{40+x}$
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