(df/dx) + (df/dy)* (dy/dx) = df(x,y)/dx(adsbygoogle = window.adsbygoogle || []).push({});

My book mentions the chain rule to obtain the right side of the equation, but I don't see how. The chain rule has no mention of addition. The furthest I got was applying the chain rule to the right operant resulting in:

df/dx + df/dx = 2(df/dx)

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# Chain rule

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