જો $\cos A + \cos B = \cos C$ અને $\sin A + \sin B = \sin C$ હોય,તો પદાવલિ $\frac{\sin(A + B)}{\sin 2C}$ નું મૂલ્ય શું થાય?

  • A
    $0$
  • B
    $1$
  • C
    $2$
  • D
    $3$

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$\cos 20^{\circ} \cos 40^{\circ} \cos 60^{\circ} \cos 80^{\circ} = $

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