$\tan \frac{2 \pi}{7} \cdot \tan \frac{4 \pi}{7} + \tan \frac{4 \pi}{7} \cdot \tan \frac{\pi}{7} + \tan \frac{\pi}{7} \cdot \tan \frac{2 \pi}{7} = $

  • A
    $7$
  • B
    $-7$
  • C
    $3$
  • D
    $-3$

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यदि $\tan A + \cot A = 4$ है,तो $\tan^4 A + \cot^4 A$ का मान क्या होगा?

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