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Addition
Z1 = a + bi
Z2 = c + di
Z1 + Z2 = (a + c) + (b + d)i
Subtraction
Z1 - Z2 = (a - c) + (b - d)i
Multiplication
Z1 * Z2 = (a + bi)(c + di) = (ac - bd) + (ad + bc)i
conjugation
^-z^-= a - bi
Modulus
|z| = \sqrt{a² + b²}
Cycles of i
i
i² = -1
iÂł = -i
i^4 = 1
i^5 = i