Which of the following when simplified reduced to unity?....

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Which of the following when simplified reduced to
\( \mathrm{P} \)
unity?
(1) \( \quad \log _{3} \log _{27} \log _{4} 64 \)
(2) \( 2 \log _{18}(\sqrt{2}+\sqrt{8}) \)
(3) \( \log _{2} \sqrt{10}+\log _{2}\left(\frac{2}{\sqrt{5}}\right) \)
(4) \( \quad-\log _{\sqrt{2}-1}(\sqrt{2}+1) \)


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