In deriving the product rule,(adsbygoogle = window.adsbygoogle || []).push({});

d(uv) = (u + du)(v + dv) - uv

= udv + vdu + dudv

The next step in the derivation is to consider dudv = 0 because it is "negligible". I have seen this elsewhere too.

I can see that dudv would be a very small number, but why is it valid to say that dudv = 0?

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# Differential by another differential

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