$\cot \frac{\pi}{20} \cot \frac{3 \pi}{20} \cot \frac{5 \pi}{20} \cot \frac{7 \pi}{20} \cot \frac{9 \pi}{20}$ का मान है

  • A
    $-1$
  • B
    $\frac{1}{2}$
  • C
    $0$
  • D
    $1$

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