જો $ABCD$ એક ચક્રીય ચતુષ્કોણ હોય,તો $\cos A - \cos B + \cos C - \cos D$ ની કિંમત શું થાય?

  • A
    $0$
  • B
    $1$
  • C
    $2(\cos B - \cos D)$
  • D
    $2(\cos A - \cos C)$

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