What is sin (α + β) - 2sin α cos β + sin (α - β) equal to? – McqOptions

MCQOPTIONS

1.	What is sin (α + β) - 2sin α cos β + sin (α - β) equal to?
A.	0
B.	2 sin α
C.	2 sin β
D.	sin α + sin β
Answer» B. 2 sin α

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