જો $\cos(\theta - \alpha) = a$ અને $\sin(\theta - \beta) = b$ હોય, તો $\cos^2(\alpha - \beta) + 2ab \sin(\alpha - \beta) + \cos^2(\theta - \alpha)$ ની કિંમત શું થાય?
- A$a^2 + b^2$
- B$a^2 - b^2$
- C$b^2 - a^2$
- D$a^2 + 2b^2$
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