$\frac{\sec 8A - 1}{\sec 4A - 1} = $

  • A
    $\frac{\tan 2A}{\tan 8A}$
  • B
    $\frac{\tan 8A}{\tan 2A}$
  • C
    $\frac{\cot 8A}{\cot 2A}$
  • D
    इनमें से कोई नहीं

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यदि $\tan \theta - \cot \theta = a$ और $\sin \theta + \cos \theta = b$ है,तो ${({b^2} - 1)^2}({a^2} + 4)$ का मान ज्ञात कीजिए।

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