Q .     If `2\sin h^{-1} (\ frac {a}{\sqrt {1 - a^{2}}} ) = \log (\ frac {1 + x}{1 - x} )` then `x =`

EAMCET 2015
A

`a`

B

`frac {1}{a}`

C

`\sqrt {1 - a^{2}}`

D

`frac {1}{\sqrt {1 - a^{2}}}`

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