[SOLVED] Help for a little demonstration

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Ferdy88

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Admittance: help for a little demonstration

Hi all,
I don't succeed to prove these two expressions:
y'1= -1/y'2 (1a)
y'3= -1/y'4 (1b)
The article is this:
**broken link removed**
I hope that someone can help me showing the mathematical steps.
 
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