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Multiplication of two complex numbers to obtain a third complex number requires the magnitudes to be multiplied and the phases to be added, whereas division

Multiplication of two complex numbers to obtain a third complex number requires the magnitudes to be multiplied and the phases to be added, whereas division of one complex number by another requires division of one magnitude by another and subtraction of the denominator phase from the numerator phase. These operations are done for the data in each frequency bin.

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