by for e
e^(iπ) + 1 = 0
e^(iπ) = -1
e^(iπ) = e^(iπ)
1 = -(e^(iπ))
-1 = e^(iπ)
0 = (e^(iπ)) + 1
1 = ...
Q.E.D.
:。
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