Here’s an interesting look at the interconnectedness of mathematics in our world as seen by Dominic Walliman. He holds a Ph.D. in Quantum Device Physics, so he probably knows what he’s talking about!
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https://youtu.be/f0DEN7ooXRo?si=R4bbGw-1aXNOLH77
https://youtu.be/JZsLnxPQ680 This video shows 4 examples. It provides a step-by-step commentary on how to rearrange what appear to be complicated equations.