यदि $\tan \theta = \frac{1}{3}$ है,तो $\cos 2 \theta = $

  • A
    $\frac{1}{4}$
  • B
    $\frac{1}{10}$
  • C
    $\frac{1}{5}$
  • D
    $\frac{4}{5}$

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यदि $\cos \theta = \frac{-3}{5}$ और $\pi < \theta < \frac{3 \pi}{2}$ है,तो $\tan \left(\frac{\theta}{2}\right) = $

यदि $\sin \theta = -\frac{3}{4}$ है,तो $\sin 2 \theta = $

यदि $\tan \frac{A}{2} = \frac{3}{2}$ है,तो $\frac{1 + \cos A}{1 - \cos A} = $

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