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#2 Help Me ! » help with understanding an equation » 2016-07-07 23:28:06

scs_t6
Replies: 3

Hi

This is my first post here.

I have a question regarding the equation below. How do I get from line 1 to line 2?  I mean the part (1-e^x)^(-1) = (1+e^x+e^2x+e^3x+...)

u8W31jJ.jpg

Thanks for help.

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