यदि $\tan \left(\frac{x}{2}\right) = \frac{m}{n}$ है,तो $m \sin (x) + n \cos (x)$ का मान किसके बराबर है?

  • A
    $m$
  • B
    $-m$
  • C
    $-n$
  • D
    $n$

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यदि $\cos \theta = \frac{1}{2}\left( a + \frac{1}{a} \right)$ है,तो $\cos 3\theta$ का मान क्या है?

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