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[" 19) 1/6(b) I/3"],[" 19.The number of ...

[" 19) 1/6(b) I/3"],[" 19.The number of values of "alpha" in "[0,2 pi]" for which "],[2sin^(3)alpha-7sin^(2)alpha+7sin alpha=2," is "],[[" (a) "6," (b) "4," (c) "3," (d) "1]]

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