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Reported Question / Answer
Q.) cos(α + β)cos(α - β) =
1)
cos<sup>2</sup>α-sin<sup>2</sup>β
2)
sin<sup>2</sup>α-cos<sup>2</sup>β
3)
2cosα
4)
2sinα
5)
NULL
Answer :
1
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Human Verification : Answer 2 + 3 = ?
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