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Reported Question / Answer
Q.) cos2α =
1)
cos<sup>2</sup>α - sin<sup>2</sup>α
2)
2sin<sup>2</sup>α +1
3)
2sin<sup>2</sup>α -1
4)
2cos<sup>2</sup>α +1
5)
NULL
Answer :
1
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Message / Correct Answer / Suggestion
Human Verification : Answer 2 + 3 = ?
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