यदि $\sin x + \cos x = \frac{1}{5}$ है,तो $\tan 2x$ का मान ज्ञात कीजिए।

  • A
    $\frac{25}{17}$
  • B
    $\frac{7}{25}$
  • C
    $\frac{25}{7}$
  • D
    $\frac{24}{7}$

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$2\cos x - \cos 3x - \cos 5x = $

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