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

Question

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 ?

Options:

A . 0

B . 1

C . -1

D . 2

Answer: Option A

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