Returns the sum of complex numbers.
IMSUM(complexnum1, complexnum2, ... complexnum29)
complexnum1, complexnum2, ... are complex numbers as text, or references to cells / cell ranges containing complex numbers as text.
returns 4+6i as text.
where cell A1 contains the text 1+2i and cell A2 contains 3+4i, returns 4+6i as text.