Answer
$-2$
Work Step by Step
use the formula where $a_{4} = -b_{4} =2, a_{5}= -b_{5} =4$.
$((\frac{2}{-2})^{3} + (\frac{4}{-4})^{3})$
=$(-1)^{3} + (-1)^{3}$
=$-1-1$
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