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# differentiation watch

1. If you differentiate lnx it's 1/x.
so surely if you differentiate 1/x it's Inx? The book says -x^-2??
2. So by what you're saying , which isn't true.

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3. (Original post by Chelsea12345)
If you differentiate lnx it's 1/x.
so surely if you differentiate 1/x it's Inx? The book says -x^-2??
If you integrate 1/x, you get back to ln(x). Integration and differentiation are (roughly) inverse operations.
4. (Original post by atsruser)
If you integrate 1/x, you get back to ln(x). Integration and differentiation are (roughly) inverse operations.
Thankyou! That makes sense!

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