$13x+13y$
$4^2x\:4^4x\:4^4$
$4t^{-5}\cdot2t^{-3}$
$\int\left(x-3\right)^{2}dx$
$\int\left(\sec8x\tan8xdx$
$\lim_{x\to3}\left(\frac{\sqrt{x}^2-9}{x-3}\right)$
$\left(-2\right)^5-\left(-3^3\right)$
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