$\frac{\sqrt{\left(x-2\right)\left(x+2\right)}}{x}$
$4\cdot10+2\cdot8-6^2$
$\frac{x^3}{x^4-1}$
$\left(2x+3y\right).\left(2x-1\right)$
$\int x^{-3}\left(1+x^{-2}\right)^{-3}dx$
$cos^2x-sin^2x=1$
$4a^{16}-2$
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