Answer
$... =5^{8+8+8+8}=5^{8\cdot 4}=5^{32}$
Work Step by Step
$(5^{8})^{4}=5^{8}\cdot 5^{8}\cdot 5^{8}\cdot 5^{8}=5^{8+8+8+8}=5^{8\cdot 4}=5^{32}$
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