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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`

A

`2(cos A + cos C)`

B

`2(cos A + cos B)`

C

`2(cos A + cos D)`

D

0'

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The correct Answer is:
D
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