In Zee "Einstei gravity in a nutshell" section I.6, page 83, the author says about the approxiamtion of the south pole of sphere(adsbygoogle = window.adsbygoogle || []).push({});

How is the first equation approximated by the second? One page later he does this expansion again.

Is this thecalculus Leibnitz rule? Or some clever trick?

Thank you!

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# I Tangent plane in Zee text

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