Let A, B, C, D be the angles of a quadrilateral. If they are concyclic – McqOptions

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1.	Let A, B, C, D be the angles of a quadrilateral. If they are concyclic, then the value of cos A + cos B + cos C + cos D is
A.	0
B.	1
C.	- 1
D.	2
Answer» B. 1

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