$(\cos \alpha+\cos \beta)^2+(\sin \alpha+\sin \beta)^2$ का मान है

  • A
    $2 \sin ^2\left(\frac{\alpha-\beta}{2}\right)$
  • B
    $2 \cos ^2\left(\frac{\alpha-\beta}{2}\right)$
  • C
    $4 \cos ^2\left(\frac{\alpha-\beta}{2}\right)$
  • D
    $4 \sin ^2\left(\frac{\alpha-\beta}{2}\right)$

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