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Reported Question / Answer
Q.) 2cosαsinβ =
1)
cos(α + β)+ cos(α - β)
2)
cos(α + β)- cos(α - β)
3)
sin(α + β)+ sin(α - β)
4)
sin(α + β)- sin(α - β)
5)
NULL
Answer :
4
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Message / Correct Answer / Suggestion
Human Verification : Answer 2 + 3 = ?
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