Answer
$=1$
Work Step by Step
Use the fact that $\frac{a^m}{a^n}=a^{m-n}$ to simplify the expression to $$=\frac{6^4}{6^4}=6^{4-4}=6^0$$ Any non-zero value to the power $0$ is $1$. Therefore, $6^0=1$.
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