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The number of the values of α in [0, 2π] for which 2sin^3 α - 7 sin^2 α + 7 sin α = 2 is

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The number of the values of α in [0, 2π] for which 2sin3α - 7 sin2α + 7 sin α = 2 is

(A)   6 

(B)   4 

(C)   3 

(D)   1 

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1 Answer

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Best answer

Correct option (C).

2 sin3α − 7 sin2α + 7 sinα − 2 = 0

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