- #1
jwxie
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Homework Statement
For two waves in superposition, we have, let say
[tex]\[y_{1} = Asin(kx-wt),
y_{2} = Asin(kx-wt+\Phi )\][/tex]
We use the trig identity sin A + sin B to simplify the combination
Whereas for standing waves, we use the trig identity sin(a +/- b) to combine the result.
As I was going over the note today I noticed that, and this is bothering so I want to know why we use sin (a +/- b) for the standing wave? Can we produce the same result for standing wave y = 2A sin(kx) cos(wt) using the other trig identity I mentioned?
Thank you for any input!