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**Chapter 2 / Re: Week 2 Lec 1 (Chapter 2) question**

« **on:**January 17, 2022, 08:19:53 PM »

$C=xe^{-t}$, so D is a function of $\phi$, therefore $D=\phi({xe^{-t}} )$ ? Yes, but "$D$ is a function of it"