$\frac{secx}{sin^3x}$
$2^3m^{-4}n^{-1}x$
$5-x-x^2+3x-2$
$-2x+5+-16x+5$
$9^2\:-\sqrt{10.000}$
$243+3a^2$
$\frac{a^5}{a^{-3}}$
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