My textbook has this excerpt:(adsbygoogle = window.adsbygoogle || []).push({});

I am not sure why it refers to Example 10.6 as that is unrelated. I don't understand to be honest. How can you calculate the Thevenin equivalent at different frequencies? Let us say that you have two voltage source: v_{1}(t)=10cos(5t) and v_{2}(t)=10cos(2t). So how do you calculate the Thevenin equivalent at the first frequency of 5 Hz? Do you change v_{2}'s frequency to 5 Hz?

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# Thevenin's Theorem: AC Circuits with Different Frequencies

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