Why is the derivative of lnx equal to 1/x?

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Ever wondered why the derivative of ln x turns out to be 1/x? In this video I will show you a proof that the derivative is ln x using the chain rule. This will help with you understanding of natural logarithms.
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Straightforward and uncomplicated, thanks!

libelldrian
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My further maths class really enjoyed this!

vishaalpatel
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Khan Academy has a proof using the limit definition of the derivative. It's interesting but involves many more steps. This is more elegant. But a student would need to know about the chain rule. I like both proofs but this one is far more efficient.

divermike
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