January 17th, 2010, 03:51 PM  #1 
Senior Member Joined: Nov 2009 Posts: 169 Thanks: 0  Calculate F'(x)
F(x) = why can't I just sub cosx in and get ? 
January 17th, 2010, 05:58 PM  #2  
Global Moderator Joined: May 2007 Posts: 6,806 Thanks: 716  Re: Calculate F'(x) Quote:
From elem. calculus you have df/dx = (df/du)(du/dx). For your problem, you have u=cosx. is the df/du part. du/dx = sinx is needed to get the correct result.  
January 18th, 2010, 03:52 PM  #3 
Newbie Joined: Jan 2010 Posts: 1 Thanks: 0  Re: Calculate F'(x)
If then: where a is a constant. 

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