Solve the complex equation Z ^ 3 = I,
z^3=i=e^(i*π/2)=e^(i*π/2+i*2kπ)
So z = e ^ (I * π / 6 + I * 2K π / 3) = √ 3 / 2 + I / 2 or - √ 3 / 2 + I / 2 or - I
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