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 May 9th, 2017, 12:17 PM #1 Member   Joined: Feb 2017 From: henderson Posts: 36 Thanks: 0 confused on derivative rules so I have ln(cos(w-1)) dont I use chain rule can somebody do a step by step? May 9th, 2017, 12:24 PM #2 Math Team   Joined: Dec 2013 From: Colombia Posts: 7,697 Thanks: 2681 Math Focus: Mainly analysis and algebra Yes, you do use the chain rule. What is the chain rule? And how do you imagine that it might be applied here? May 9th, 2017, 12:35 PM   #3
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 Originally Posted by v8archie Yes, you do use the chain rule. What is the chain rule? And how do you imagine that it might be applied here?
f(g(x)) = f'(g(x))*g'(x)

I get 1/cos(w-1) but Im unsure what to do next im confused on it May 9th, 2017, 12:51 PM   #4
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 Originally Posted by Bobbyjoe f(g(x)) = f'(g(x))*g'(x) I get 1/cos(w-1) but Im unsure what to do next im confused on it
$g(w) = \cos(w-1)$

$g^\prime(w) = -\sin(w-1)$

$\dfrac{d}{dw} \ln(\cos(w-1)) = -\dfrac{\sin(w-1)}{\cos(w-1)} = -\tan(w-1)=\tan(1-w)$ Tags confused, derivative, rules Thread Tools Show Printable Version Email this Page Display Modes Linear Mode Switch to Hybrid Mode Switch to Threaded Mode Similar Threads Thread Thread Starter Forum Replies Last Post xboxprot Advanced Statistics 0 December 6th, 2015 01:41 PM Iwishmath Elementary Math 2 May 25th, 2014 09:47 PM seanfmglobal Algebra 2 November 30th, 2011 05:40 AM funsize999 Calculus 4 April 27th, 2009 03:40 PM khoa Calculus 1 November 27th, 2008 02:47 AM

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