Find the differential equation of system of cocentric circles with centre (1,2)

Explanation

To find the differential equation of a system of concentric circles with center (1, 2), we can follow these steps:

### Step 1: Write the equation of the circle
The general equation of a circle with center (h, k) and radius r is given by:
\[ (x - h)^2 + (y - k)^2 = r^2 \]
For our case, the center is (1, 2), so we substitute h = 1 and k = 2:
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