L24 Math 233 Lecture 16: L24 Math 233 - October 3 - Chain Rule

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3 Oct 2018
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*prof shareshian was absent, so prof wickerhauser gave the lecture. Steps to differentiate using the chain rule. Make a tree of dependencies with all the different variables. For f(x(t), y(t)) f y t x t. You just factor f into all the different variables that it depends on, then do the same for those variables until you get your independent variables (in this case t) Translate the tree into an equation of partial and full derivatives. First, you will be told which independent variable to differentiate with respect to. In this case, it will be df/dt since that is the only iv, but it could be anything. You then account for every possible path that goes from f to t. In this case, the eq"n for df/dt would be. Df/dt = df/dx * dx/dt + df/dy * dy/dt. If these need to be partials, make them partials. Example f(x(t), y(t)) = x2 + y3, x(t) = 3t, y(t) = -t.

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