यदि $\cos \theta = \frac{1}{2}\left( x + \frac{1}{x} \right)$ है,तो $\frac{1}{2}\left( x^2 + \frac{1}{x^2} \right) = $

  • A
    $\sin 2\theta $
  • B
    $\cos 2\theta $
  • C
    $\tan 2\theta $
  • D
    $\sec 2\theta $

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सिद्ध कीजिए कि $\frac{\sin 5x - 2\sin 3x + \sin x}{\cos 5x - \cos x} = \tan x$.

यदि $\cos 3\theta = \alpha \cos \theta + \beta \cos^3 \theta$ है,तो $(\alpha, \beta) = $

यदि $\csc \theta = \frac{p + q}{p - q}$ $(p \neq q \neq 0)$ है,तो $\left| \cot \left( \frac{\pi}{4} + \frac{\theta}{2} \right) \right|$ का मान ज्ञात कीजिए।

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