Simplify: sin (A + B) sin (A – B) – McqOptions

MCQOPTIONS

1.	Simplify: sin (A + B) sin (A – B)
A.	sin2 A – sin2 B
B.	cos2 A – cos2 B
C.	sin2 A + sin2 B
D.	cos2 A
Answer» B. cos2 A – cos2 B

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