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differentiating power series
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I am studying differentiation of power series. My professor posted an example which I understand for the most part except for step 3 where there is another (1/3) multiplied at the end. I'm not sure where it comes from. Could someone explain this to me?

https://preview.redd.it/fiv2nds1fu1c1.png?width=946&format=png&auto=webp&s=94150bcd842ce8ffa9a4122b398ebe08e958ce50

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11 months ago