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