third example in chapter 12.2 (The chain rule)

[bartsnapp]

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[bartsnapp]

The third example in chapter 12.2 (The chain rule) seems to expect g'(h(x)) to be 3(2x+1) where g(x)=x^3+5 and h(x)=2x+1 (so it should expect 3(2x+1)^2). Pictures attached.