$\left(a^8+b^4\right)\left(a^8-b^4\right)$
$4x-16>-16$
$-8n\left(n+7\right)-3n\left(4n+3\right)$
$x+20=0$
$97.003-23.4$
$\frac{a^{-7}}{a^{20}}$
$\cos2a\:-\:cos\:6a$
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