What is sin2 (α – β) + 2ab cos (α – β) equal to? – McqOptions

MCQOPTIONS

1.	What is sin2 (α – β) + 2ab cos (α – β) equal to?
A.	a2 + b2
B.	a2 – b2
C.	b2 – a2
D.	–(a2 + b2)
Answer» B. a2 – b2

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