Complex Numbers
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1) Textbook style explanation: www.purplemath.com/modules/complex.htm
2) Explanation and practice problems: http://www.mathsisfun.com/numbers/complex-numbers.html
3) LOTS of resources and topics: https://www.khanacademy.org/math/algebra/complex-numbers
2) Explanation and practice problems: http://www.mathsisfun.com/numbers/complex-numbers.html
3) LOTS of resources and topics: https://www.khanacademy.org/math/algebra/complex-numbers