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[[Euler]]'s formula is the following definition in complex analysis making use of the imaginary number <math>i</math>:
[[Euler]]'s formula is the following definition in complex analysis making use of the [[imaginary number]] <math>i</math>:
:<math>e^{i\phi} = \cos \phi + i\sin \phi \!</math>
:<math>e^{i\phi} = \cos \phi + i\sin \phi \!</math>
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[[category:mathematics]]
[[category:mathematics]]