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Perhaps it's Euler's Theorem that you're asking about. Euler's Theorem does not deal with complex numbers, but Euler's Formula does:
eiθ = cos(θ) + i*sin(θ). Where θ is measured in radians.
Yes, it is a property of homogeneous function.
useless
well his Theorem is OK but when will we need it in life!?!?
Hermann Euler has written:
'Hermann Euler und Daisy Campi' -- subject(s): Exhibitions
Ulf S. von Euler has written:
'Prostaglandins' -- subject(s): Prostaglandins, Prostaglandine
'Noradrenaline' -- subject(s): Noradrenaline