$1 - 2{\sin ^2}\left( {\frac{\pi }{4} + \theta } \right) = $

  • A
    $\cos 2\theta $
  • B
    $ - \cos 2\theta $
  • C
    $\sin 2\theta $
  • D
    $ - \sin 2\theta $

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यदि $\cos \theta = \frac{3}{5}$ और $\cos \phi = \frac{4}{5}$ है,जहाँ $\theta$ और $\phi$ धनात्मक न्यून कोण हैं,तो $\cos \frac{\theta - \phi}{2} = $

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