$\left(x^8-20\right)\left(x^8-5\right)$
$\frac{p}{x}-\frac{y}{z}+3$
$a^2-16-x^2+36+12a-3x$
$\sqrt{x+10}-7=-5$
$1236.005+1478.007$
$-3\cdot2\:\frac{2}{3}-12$
$\frac{tanx}{secx-1}-\frac{tanx}{secx+1}$
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