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[[Euler]]'s formula is the following identity in complex analysis making use of the [[imaginary number]] <math>i</math>:
'''[[Euler]]'s formula''' is the following identity 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>