$\tan \frac{\pi}{5}+2 \tan \frac{2 \pi}{5}+4 \cot \frac{4 \pi}{5}$ का मान ज्ञात कीजिए।

  • A
    $\cot \frac{\pi}{5}$
  • B
    $\cot \frac{2\pi}{5}$
  • C
    $\cot \frac{3\pi}{5}$
  • D
    $\cot \frac{4\pi}{5}$

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मान ज्ञात कीजिए: $\left(1+\cos \frac{\pi}{8}\right)\left(1+\cos \frac{3 \pi}{8}\right)\left(1+\cos \frac{5 \pi}{8}\right)\left(1+\cos \frac{7 \pi}{8}\right)$

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