February 8th, 2013, 06:10 AM  #1 
Senior Member Joined: Oct 2009 Posts: 895 Thanks: 1  mathematics  Q 7
Hi all Can please check my answer :  
February 8th, 2013, 08:19 AM  #2 
Senior Member Joined: Jul 2010 From: St. Augustine, FL., U.S.A.'s oldest city Posts: 12,211 Thanks: 521 Math Focus: Calculus/ODEs  Re: mathematics  Q 7
No, your applications of the rules of differentiation in places is incorrect. I would write: Now differentiate with respect to Differentiate again: 
February 8th, 2013, 10:16 AM  #3 
Senior Member Joined: Oct 2009 Posts: 895 Thanks: 1  Re: mathematics  Q 7
thanks so much


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