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• 23:43, 11 March 2022 Wikiadmin talk contribs created page Chain rule for single variable functions (Created page with "The chain rule is, intuitively, a product of two derivatives. Suppose that we have a person walking at a speed of 2 m/s. Now suppose we have a train moving at 20 m/s in the same direction as the person. The train is obviously 10x faster than the walking person, if we are measuring in respect to the static ground. Now imagine that the person is walking at 2 m/s while inside the train moving at 20 m/s. What's the speed of the person? We have a physics problem here, because...")