- #1
Peter G.
- 442
- 0
Hi
So, this is what I have to solve: 2sin2x - 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!
So, this is what I have to solve: 2sin2x - 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!