जब $\theta = \frac{\pi}{15}$ है,तो $(1-\cos \theta)(1+\cos \theta)(1+\cot^2 \theta)$ का मान क्या होगा?

  • A
    $1$
  • B
    $\frac{1}{2}$
  • C
    $\frac{-1}{\sqrt{3}}$
  • D
    $2$

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