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So, this is what I have to solve: 2sin

^{2}x - sin x = 0

I got two possibilities:

sin x = 0.5

sin x = 0

From the second equation:

I got 0 and 180, or, in other words, 0 and 3.14. The book has these two answers but the only other answer it has is 6.28 (and by the way, my domain is 0 <= x <= 2π)

I tried in my calculator and the other answers I got seem to work: 30 degrees and 150 degrees but then, so does 6.28 which I am assuming the book got by adding 2π to the answer 0 from the second equation...

What am I doing wrong. Is the book missing my answers?

Thanks in advance!