If \( A B C D \) is a cyclic quadrilateral, then the value of \( \cos ^{2} A-\cos ^{2} B-\cos ^{...

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If \( A B C D \) is a cyclic quadrilateral, then the value of \( \cos ^{2} A-\cos ^{2} B-\cos ^{2} C+\cos ^{2} D \) is
(a) 0
(b) 1
(c) \( -1 \)
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