The ratio \( \frac{2^{\log _{2^{1 / 4}} a}-3^{\log _{27}\left(a^{2}+1\right)^{s}}-2 a}{7^{4 \log...

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The ratio \( \frac{2^{\log _{2^{1 / 4}} a}-3^{\log _{27}\left(a^{2}+1\right)^{s}}-2 a}{7^{4 \log _{49} a}-a-1} \) simplifies to:
(A) \( a^{2}-a-1 \)
(B) \( a^{2}+a-1 \)
(C) \( a^{2}-a+1 \)
(D) \( a^{2}+a+1 \)
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