A) \[\log (x+\sqrt{{{x}^{2}}+1})\]
B) \[\log (x+\sqrt{{{x}^{2}}-1})\]
C) \[\log (x+\sqrt{1-{{x}^{2}}})\]
D) \[\log (x-\sqrt{{{x}^{2}}-1})\]
Correct Answer: B
Solution :
\[{{\cosh }^{-1}}x=\log (x+\sqrt{{{x}^{2}}-1})\]
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