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[" Q.6If "ABCD" is a cyclic quadrilatera...

[" Q.6If "ABCD" is a cyclic quadrilateral,then the value "],[" of "cos A-cos B+cos C-cos D-],[=(A)0],[" (B) "1],[" (C) "2(cos B-cos D)],[" (D) "2(cos A-cos C)]

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