यदि $2 \tan^{-1}(\cos x) = \tan^{-1}(2 \operatorname{cosec} x)$ है,तो $x$ का मान ज्ञात कीजिए।

  • A
    $-\frac{\pi}{4}$
  • B
    $0$
  • C
    $\frac{\pi}{8}$
  • D
    $\frac{\pi}{4}$

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अंतराल $\left[-\frac{\pi}{4}, \frac{3 \pi}{4}\right]$ में $\sec ^{-1}\left(\frac{1}{4} \sum_{k=0}^{10} \sec \left(\frac{7 \pi}{12}+\frac{k \pi}{2}\right) \sec \left(\frac{7 \pi}{12}+\frac{(k+1) \pi}{2}\right)\right)$ का मान क्या है?

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