If ABCD is a cyclic quadrilateral, then ...

If ABCD is a cyclic quadrilateral, then the value of `cosA-cosB+cosC-cosD` is............... A) 0 B) 1 C) `2(cos B- cos D)` D) `2 (cos A- cos C)`

A

0

B

1

C

`2(cos B- cos D)`

D

`2 (cos A- cos C)`

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The correct Answer is:

A

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