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===Multiplication{{anchor|Multiplication|Square}}===
[[File:complex_number_multiplication_visualisation.svg|thumb|Multiplication of complex numbers {{math|2−''i''}} and {{math|3+4''i''}} visualised with vectors]]
The product of two complex numbers is computed as follows:
:<math>(a+bi) \cdot (c+di) = ac - bd + (ad+bc)i.</math>
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