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OpenStudy (a1234):
Find the solutions of sin5x + sin3x = 0 in the interval [0, 2pi).
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OpenStudy (a1234):
I got to 2sin4x cosx = 0 and got the solutions 0, pi, pi/2, and 3pi/2. I feel like some solutions are missing...
OpenStudy (tkhunny):
What did you do to obtain that answer set?
OpenStudy (a1234):
2sin4x = 0 cosx = 0 2sin4x = 0 equals sin4x = 0
OpenStudy (a1234):
@tkhunny
OpenStudy (tkhunny):
?? Where did you get sin(4x)?
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OpenStudy (a1234):
Divided the 2 from both sides...not sure if it would work
OpenStudy (tkhunny):
Try this: \(\sin(5x) = \sin(4x + x) = \sin(4x)\cos(x) + \cos(4x)\sin(x)\) You do this one: \(\sin(3x) = \sin(4x - x) = \)
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