How do you solve 2 sin 2 theta - 3 sin theta using trigonometric functions

I know the answers to the problem are k pi, .723 + 2k pi, and 5.560 + 2k pi.

I do not understand how they get the answer kpi though.
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2sin 2theta-3costheta =2[2sin theta costheta]-3sin theta =4sin theta cos theta-3sin theta =sin theta cos theta
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