$0 \le \alpha_1, \alpha_2, \dots, \alpha_n \le \frac{\pi}{2}$ અને $\cot \alpha_1 \cdot \cot \alpha_2 \cdots \cot \alpha_n = 1$ ની શરતો હેઠળ $\cos \alpha_1 \cdot \cos \alpha_2 \cdots \cos \alpha_n$ નું મહત્તમ મૂલ્ય શું છે?

  • A
    $\frac{1}{2^{n/2}}$
  • B
    $\frac{1}{2^n}$
  • C
    $\frac{1}{2n}$
  • D
    $1$

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