જો $\cos(\theta - \alpha) = a$ અને $\sin(\theta - \beta) = b$ હોય,તો $\cos^2(\alpha - \beta) + 2ab\sin(\alpha - \beta)$ ની કિંમત શોધો.

  • A
    $4a^2b^2$
  • B
    $a^2 - b^2$
  • C
    $a^2 + b^2$
  • D
    $-a^2b^2$

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