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

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

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