यदि $\cos (A + B) = \alpha \cos A \cos B + \beta \sin A \sin B$ है,तो $(\alpha, \beta) =$

  • A
    $(-1, -1)$
  • B
    $(-1, 1)$
  • C
    $(1, -1)$
  • D
    $(1, 1)$

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