Dexter, a math lover, claims that he has proven \(e^{2i}=1\), but applying the Euler's formula \(e^{ix}=\cos x + i \sin x\), \(e^{2i}\) is actually a complex number. In which of these steps does he first make a mistake?

**Step 1**: As we know, \(e^{i\pi}=-1\).

**Step 2**: Squaring both sides, we get \(\big(e^{i\pi}\big)^2=1\).

**Step 3**: Exchanging the exponents, \(\big(e^{2i}\big)^\pi=1\).

**Step 4**: Multiplying \(\frac{1}{\pi}\) at the exponents of both sides, we claim that \(e^{2i}=1\).

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