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