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Hello, I'd like to know how in developing, factoring or simplifying, we can move from:

A + ( (1 / ( (1 / ICD) + IED) )

to:

ACD *( ( - ED + I ) / (1 - ECD^2 ) )

ACDE are strictly positive real constants.
I is an imaginary number.

2 answers

I don't get it either. Parentheses are mismatched, and I get this.

A + CD/(1-ECD^2) I

Check for typos. The upper-case is annoying, too.
I made a picture.

goo.gl/zZdzSs