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z = cos(x) + isin(x)
dz = -sin(x) + icos(x)dx
= i(isin(x) + cos(x))dx
∫ dz/z = ∫ idx
ln(z) = ix
e^(ix) = z
e^(ix) = cos(x) + isin(x)
dz = -sin(x) + icos(x)dx
= i(isin(x) + cos(x))dx
∫ dz/z = ∫ idx
ln(z) = ix
e^(ix) = z
e^(ix) = cos(x) + isin(x)