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If A ,B ,C ,D are angles of a cyclic qua...

If `A ,B ,C ,D` are angles of a cyclic quadrilateral, then prove that `cos A+cos B+cos C+cos D=0`

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Knowledge Check

  • If A,B,C,D are the angles of a cyclic quadrilateral and cos A+cos B= K(cos C + cos D), then the value of K is

    A
    1
    B
    `-1`
    C
    2
    D
    `-2`
  • If ABCD is a cyclic quadrilateral, then cos A + cos B is equal to

    A
    0
    B
    `cos C + cos D`
    C
    `- (cos C+ cos D)`
    D
    `cos C- cos D`
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