यदि $\sinh u = \tan \theta$ है,तो $\cosh u$ किसके बराबर है?

  • A
    $-\sec \theta$
  • B
    $\sec \theta$
  • C
    $\sin \theta$
  • D
    $\cot \theta$

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माना $n$ एक धनात्मक पूर्णांक है जिसके लिए $\sin \frac{\pi }{2^n} + \cos \frac{\pi }{2^n} = \frac{\sqrt{n}}{2}$ है। तो

$\sum_{k=0}^4 \sin^2 \left( (2k+1) \frac{\pi}{20} \right) =$

यदि $\tan \theta \cdot \tan \left(120^{\circ}-\theta\right) \tan \left(120^{\circ}+\theta\right)=\frac{1}{\sqrt{3}}$ है,तो $\theta$ का मान ज्ञात कीजिए।

यदि $\sin x + \sin y = \frac{7}{5}$ और $\cos x + \cos y = \frac{1}{5}$ है,तो $\sin(x + y)$ का मान ज्ञात कीजिए।

यदि $\sin \theta + \operatorname{cosec} \theta = 4$ है,तो $\sin^2 \theta + \operatorname{cosec}^2 \theta = $

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