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