Current location - Education and Training Encyclopedia - University rankings - College physics, simple harmonic, standing wave equation, for example, I can't count the first place I drew, and I don't know what the second place means. Please advise.
College physics, simple harmonic, standing wave equation, for example, I can't count the first place I drew, and I don't know what the second place means. Please advise.
Cosine formula change, simplified diagram of cosa+cosb

The generating conditions of the junction, where the value at y is 0, and the standing wave junction is generated, are all nodes with special function values. Look at the picture box. The formula is simplified but not written. a+b and a-b are converted by themselves.

To expand, if it is a relative inverse point, how to calculate this, the principle is the same.