$\frac{d}{dx}e^{-15x}$
$6x^2-90x+225$
$25^{.5}$
$\sqrt[2]{5^{2+x}}$
$x^2-4x+1=\:0$
$\left(x^{-1}y+4\right)\left(5y^4z^m\right)$
$\lim_{x\to9}\left(\frac{3}{9-x}-\sqrt{x}\right)$
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