यदि $\cos \frac{\pi}{4} \cos \frac{\pi}{8} \cos \frac{\pi}{16} \cos \frac{\pi}{32} = 2^m \operatorname{cosec} \frac{\pi}{n}$ है,तो $m+n=$

  • A
    $27$
  • B
    $25$
  • C
    $28$
  • D
    $29$

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$\left( \frac{\sin 2A}{1 + \cos 2A} \right) \left( \frac{\cos A}{1 + \cos A} \right) = $

निम्नलिखित में से कौन सी संख्या/संख्याएँ परिमेय हैं?

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