ત્રિકોણ $ABC$ માં,જો $\cos A \cos B + \sin A \sin B \sin C = 1$ હોય,તો $\sin A + \sin B + \sin C =$

  • A
    $\frac{2+\sqrt{3}}{2}$
  • B
    $1+\sqrt{2}$
  • C
    $\frac{2\sqrt{3}-1}{2}$
  • D
    $\frac{3+\sqrt{3}}{2}$

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$k$ ની કઈ કિંમત માટે $(\cos x + \sin x)^2 + k \sin x \cos x - 1 = 0$ એ નિત્યસમ બને?

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