જો $\cos^6 \alpha + \sin^6 \alpha + K \sin^2 2\alpha = 1$ હોય,તો $K =$

  • A
    $\frac{4}{3}$
  • B
    $\frac{3}{4}$
  • C
    $\frac{1}{2}$
  • D
    $2$

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