Ex: Find Partial Derivative Values for a Square Root Function of Two Variables

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This video provides two examples of how to find a partial derivative function value. The results are verified by analyzing the slope of a tangent line to the surface.
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Sir, why can we apply the chain rule for an ordinary derivative when attempting to take the partial derivative? I am quite lost on this subject as I have learned there are only 2 chain rules for 2 different cases for partial differentiation. I don't understand how we can just substitute u in and then find the partial derivative to be the ordinary derivative of F wrt to U multiplied by the derivative of u wrt x. I don't see this formula in my textbook for the multivariable portion

AlbertFung-sh
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Great math tutorial !! Keep up the good content

jhchecri
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very very good. do more advance math examples, like high uni math levels

nemer
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