I'll probably kick myself when someone explains it, but I can't understand where the 1/12 comes from after the re-substitution of u? I thought it would be 1/3, but it clearly isn't. Why is that?
Thanks for input on this.
2026-03-27 22:52:40.1774651960
Understanding a Wolfram|Alpha explanation on a simple integral
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Since x is cubed, when the 1/2 is factored it turns into 1/8. Then 2/3 times 1/8 is 1/12.