$2{\tan ^{ - 1}}\left[ {\sqrt {\frac{{a - b}}{{a + b}}} \tan \frac{\theta }{2}} \right] = $

  • A
    ${\cos ^{ - 1}}\left( {\frac{{a\cos \theta + b}}{{a + b\cos \theta }}} \right)$
  • B
    ${\cos ^{ - 1}}\left( {\frac{{a + b\cos \theta }}{{a\cos \theta + b}}} \right)$
  • C
    ${\cos ^{ - 1}}\left( {\frac{{a\cos \theta }}{{a + b\cos \theta }}} \right)$
  • D
    ${\cos ^{ - 1}}\left( {\frac{{a\cos \theta + b\theta }}{{a + b\cos \theta }}} \right)$

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