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Question

Question: \(\sec h^{\text{-1}}\left( \frac{1}{2} \right)\) is...

sech-1(12)\sec h^{\text{-1}}\left( \frac{1}{2} \right) is

A

log(3+2)\log(\sqrt{3} + \sqrt{2})

B

log(3+1)\log(\sqrt{3} + 1)

C

log(2+3)\log(2 + \sqrt{3})

D

None of these

Answer

log(2+3)\log(2 + \sqrt{3})

Explanation

Solution

sech1(12)=cosh1(2)\sec h^{- 1}\left( \frac{1}{2} \right) = \cosh^{- 1}(2) =log(2+222)\log(2 + \sqrt{2^{2} - 2}) =log(2+3)\log(2 + \sqrt{3})