Go to Wolfram Alpha as a Tool for Calculations with Complex Numbers (Examples)

When you follow the link above and click on the equations, Wolfram Alpha will find the answer for you. Play with them a bit and you will get a good feeling for handling complex numbers. Please note that you should use "i" for the imaginary unit, even if you come from electronics and are used to "j" - Wolfram Alpha would interpret "j" as a variable.

There is much more that you can do with Wolfram Alpha than just calculations with complex numbers. It is not even restricted to mathematics (though this is an area where it is excellent). Just as an example, type in "Operational Amplifier". You can even ask a question in plain english. Just try not to get distracted too much from studying complex numbers...

You may also be interested in some other recommendations for Introductions to Complex Numbers.

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