$(\cos \alpha + \cos \beta )^2 + (\sin \alpha + \sin \beta )^2 = $

  • A
    $4\cos ^2\frac{\alpha - \beta }{2}$
  • B
    $4\sin ^2\frac{\alpha - \beta }{2}$
  • C
    $4\cos ^2\frac{\alpha + \beta }{2}$
  • D
    $4\sin ^2\frac{\alpha + \beta }{2}$

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