ln(exp(4*i))
Let's calculate: ln(exp(4i))
ⓘ For the principal logarithm, keep the real part of the exponent and reduce its imaginary part to (-π, π] modulo 2π: ln(exp(4i)) = i×4 -2iπ
i×4 -2iπ
ⓘ A complex number is written in algebraic form a + b*i, a being its real part and b its imaginary part: i×4 -2iπ = (4 -2π)×i
(4 -2π)×i
▶Result:   i×(4 -2π)
The numeric value of: i×(4 -2π) is:
i×(4 -2×≈ 3.1416)
i×(4 -≈ 6.2832)
i×≈ -2.2832
▷ -≈ 2.2832i