यदि $\operatorname{cosec} \theta - \sin \theta = m$ और $\sec \theta - \cos \theta = n$ है,तो $(m^2 n)^{2/3} + (m n^2)^{2/3} = $

  • A
    $-1$
  • B
    $1$
  • C
    $0$
  • D
    इनमें से कोई नहीं

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यदि $\tan \alpha = \frac{1}{7}$ और $\sin \beta = \frac{1}{\sqrt{10}}$ जहाँ $0 < \alpha, \beta < \frac{\pi}{2}$ है,तो $2\beta$ का मान ज्ञात कीजिए:

$\cos 20^\circ \cos 40^\circ \cos 80^\circ = $

$\sin \frac{\pi }{14} \sin \frac{3\pi }{14} \sin \frac{5\pi }{14} \sin \frac{7\pi }{14} \sin \frac{9\pi }{14} \sin \frac{11\pi }{14} \sin \frac{13\pi }{14}$ का मान किसके बराबर है?

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