Let's say that you need to make some quick calculations to design a simple electrical circuit. We will use the example of a series RC circuit, which consists of a resistor and a capacitor connected in series:

The voltage across the capacitor can be described by a linear, first-order differential equation. Eventually we will learn to solve differential equations with Sage, but for now we will just use the solution, which is well known:

- Define variables.
First, we'll define some variables to work ...

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