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+
+Given an RL circuit, it starts with an initial condition. 
+
+KVL defines a first order homogeneous ordinary differential equation with constant coefficients:
+
+$$ 
+	L \frac{di(t)}{dt} + Ri(t) = 0
+	-->
+L \frac{di(t)}{dt} = -Ri(t)
+$$
+
+The derivative of 
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