$\cos \left[ {{\cos }^{ - 1}}\left( {\frac{{ - 1}}{7}} \right) + {{\sin }^{ - 1}}\left( {\frac{{ - 1}}{7}} \right) \right] = $

  • A
    $ - 1/3$
  • B
    $0$
  • C
    $1/3$
  • D
    $4/9$

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