यदि $\tan \left( \frac{\pi}{4} + \theta \right) + \tan \left( \frac{\pi}{4} - \theta \right) = \lambda \sec 2\theta$ है,तो $\lambda$ =

  • A
    $3$
  • B
    $4$
  • C
    $1$
  • D
    $2$

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$\cos 24^{\circ} + \cos 55^{\circ} + \cos 155^{\circ} + \cos 204^{\circ}$ का मान क्या है?

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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