यदि $\cos(\theta - \alpha) = a$ और $\sin(\theta - \beta) = b$ है,तो $\cos^2(\alpha - \beta) + 2ab\sin(\alpha - \beta)$ का मान क्या होगा?

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

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