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# [FP2] Question, differentiating ln watch

1. For now , I am confused on part A. Now sure how to do it/solve it i.e I dont know the technique. Any help would be great.
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2. (Original post by Maths help pls)
For now , I am confused on part A. Now sure how to do it/solve it i.e I dont know the technique. Any help would be great.
Remember that if f(x) = log(g(x)), then f'(x) = g'(x)/g(x) by the chain rule. You then have to simplify the mess that comes out of this!
3. (Original post by Gregorius)
Remember that if f(x) = log(g(x)), then f'(x) = g'(x)/g(x) by the chain rule. You then have to simplify the mess that comes out of this!
Yep. Finally managed to solve it. Thank you.

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Updated: October 31, 2015
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