We have e2πin=1
So we have e2πin+1=e
which implies (e2πin+1)2πin+1=e2πin+1=e
Thus we have e−4π2n2+4πin+1=e
This implies e−4π2n2=1
Taking the limit when n→∞ gives 0=1.
Answer
Your error is (as in most of those fake-proofs) in the step where you use the power law (ab)c=abc without the conditions of that power law being fulfilled.
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