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 $540^{\circ} < A < 630^{\circ}$ और $|\cos A| = \frac{5}{13}$ है,तो $\tan \frac{A}{2} \tan A = $

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$\cos \left(22 \frac{1}{2}\right)^{\circ}$ का मान क्या है?

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