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A complex number has a real part (a) and an imaginary part (b). The number is usually written asa + bi. The plus sign (+) is a place holder - it does not mean addition. The rules for complexarithmetic are:
| Length: | ![]() | Addition: | ![]() |
|---|---|
| Subtraction: | ![]() |
| Multiplication: | ![]() |
| Division: | ![]() |
Provided that c and d are not both zero