There exists a positive real number x satisfying \[\cos (ta{{n}^{-1}}x)=x\], Then the value of \[{{\cos }^{-1}}\left( \frac{{{x}^{2}}}{2} \right)\]is

There exists a positive real number x satisfying \[\cos (ta{{n}^{-1}}x

1.	There exists a positive real number x satisfying \[\cos (ta{{n}^{-1}}x)=x\], Then the value of \[{{\cos }^{-1}}\left( \frac{{{x}^{2}}}{2} \right)\]is
A.	\[\frac{\pi }{10}\]
B.	\[\frac{\pi }{5}\]
C.	\[\frac{2\pi }{5}\]
D.	\[\frac{4\pi }{5}\]
Answer» D. \[\frac{4\pi }{5}\]

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There exists a positive real number x satisfying \[\cos (ta{{n}^{-1}}x)=x\], Then the value of \[{{\cos }^{-1}}\left( \frac{{{x}^{2}}}{2} \right)\]is

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