I got this :(adsbygoogle = window.adsbygoogle || []).push({});

1 - z / (R^2 + Z^2) ^1/2 = 1- (1+ (R/Z)^2) ^-1/2

= 1 - 1 + (1/2) ( R/Z )^2

I'm confused why it got all these steps. it seems like taylor expansion ? or ?

Thank you.

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# Homework Help: Some math met in EM hw solution

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