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/sci/ - Science & Math

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>> No.11394388 [View]
File: 147 KB, 948x566, Screen Shot 2020-02-17 at 6.02.07 PM.png [View same] [iqdb] [saucenao] [google]
11394388

Could someone explain how this works to a brainlet?
Where did the [math](sr^i)(r^{n-i})[/math] even come from?
How would I come up with this on my own?

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