Can somebody tell me what this means? dy/dx means a small change in y with respect to a small change in x. du/u means a small change in u with respect to no change in u?
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Don't reply to this. I have worked it out. In the conext it was just a bit of algebraic manipulation.
It's just a shorthand way of writing the chain rule in reverse (for integration, the reverse process of differentiation). by making the substitution .
In your case, .
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