$\cos A \cos 2 A \cos 4 A \ldots \cos 2^{n-1} A$ का मान क्या है?

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

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