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