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The number of values of $\;\alpha\;$ in $\;[0,2\pi]\;$ for which $\;2 sin^{3} \alpha -7 sin^{2} \alpha + 7 sin \alpha =2\;$is :

$(a)\;6\qquad(b)\;4\qquad(c)\;3\qquad(d)\;1$

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