The error is due to the fact that COMPLEX returns an imaginary number with (in this case) an 'i' suffix. In other words, it's a text string, not a number. You could try changing the formula to something that gets rid of the 'i'. For example:
=E4-G4/((E4*10^12*C4)*((10^12*C4)+SUBSTITUTE(COMPLEX(0,I4 ),"i","")))
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Cheers,
Paul Edstein
[Fmr MS MVP - Word]
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