If ABCD is a Cyclic Quadrilateral, then the value of cos2A – cos2B �

1.	If ABCD is a Cyclic Quadrilateral, then the value of cos2A – cos2B – cos2C + cos2D is:
A.	-1
B.	1
C.	0
D.	2
Answer» D. 2

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If ABCD is a Cyclic Quadrilateral, then the value of cos2A – cos2B – cos2C + cos2D is:

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