${\left( {\frac{{1 + \sin \theta + i\cos \theta }}{{1 + \sin \theta - i\cos \theta }}} \right)^n} = $

  • A
    $\cos \left( {\frac{{n\pi }}{2} - n\theta } \right) + i\sin \left( {\frac{{n\pi }}{2} - n\theta } \right)$
  • B
    $\cos \left( {\frac{{n\pi }}{2} + n\theta } \right) + i\sin \left( {\frac{{n\pi }}{2} + n\theta } \right)$
  • C
    $\sin \left( {\frac{{n\pi }}{2} - n\theta } \right) + i\cos \left( {\frac{{n\pi }}{2} - n\theta } \right)$
  • D
    $\cos n\left( {\frac{\pi }{2} + 2\theta } \right) + i\sin n\left( {\frac{\pi }{2} + 2\theta } \right)$

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