A possible value of $\tan \left( {{1 \over 4}{{\sin }^{ - 1}}{{\sqrt {63} } \over 8}} \right)$ is :

Question

$\sqrt 7 - 1$

${1 \over {\sqrt 7 }}$

$2\sqrt 2 - 1$

${1 \over {2\sqrt 2 }}$

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