સમીકરણ $e^{\sin x} - e^{-\sin x} - 4 = 0$ ના વાસ્તવિક બીજોની સંખ્યા કેટલી છે?

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    અનંત

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$2 \sin^2 \beta + 4 \cos(\alpha + \beta) \sin \alpha \sin \beta + \cos 2(\alpha + \beta) = $

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