I totally nose-dived on that one, ha ha. For the most part.R1/C1 comprise a Bucherot cell to suppress oscillations.
The 5v source with two 1k resistors across it result in the input being biased @ 2.5v; with 2.5mA flowing through R2 and R3. Perhaps they thought it was easier to show it that way instead of using 3.8k for R2; as 3.8k is not a standard value of resistance.
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by Jake Hertz