$\frac{z^{-4}}{z^{-8}}$
$\lim_{x\to e}\left(\frac{x^2+dx-c}{x-e}\right)$
$m^4+9m^2+81$
$\int x\cdot\sin\left(3x+1\right)dx$
$\frac{5x^2y^{-3}}{15x^5}$
$\int_0^{100}-e^{-x}dx$
$\lim_{x\to\infty}\:-1^{x-1}$
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