http://www.geocities.com/ketthianorak/rbahonvac/pride-iq/05103083306.png
Could someone tell me how iH was approximated from the equation at the top? Which approximation rule was used?

Hi macro90,

Can you give more information about iH, iF and the e series, it's hard to tell from the two equations.

this is really just an algebra question. i_H, i_F are like x and y, and i'm not even sure what E(e) is supposed to be.... don't worry about this. I'll just ask my lecturer.