यदि $\cosh \beta = \sec \alpha \cos \theta$ और $\sinh \beta = \operatorname{cosec} \alpha \sin \theta$ है,तो $\sinh^2 \beta =$

  • A
    $\sin \alpha \cos \alpha$
  • B
    $\cos^2 \alpha$
  • C
    $\sin^2 \alpha$
  • D
    $\sin \alpha + \cos \alpha$

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यदि $\cos \alpha = \operatorname{sech} \beta$ है,तो $\beta =$

यदि $\tan \theta + \cot \theta = 2$ है,तो $\sin \theta$ का मान क्या होगा?

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