What is the value of [(sin x + sin y) (sin x – sin y)] / [(cosx + co – McqOptions

MCQOPTIONS

1.	What is the value of [(sin x + sin y) (sin x – sin y)] / [(cosx + cosy) (cosy – cosx)]?
A.	0
B.	1
C.	-1
D.	2
Answer» C. -1

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