July 2nd, 2008, 06:38 PM  #1 
Newbie Joined: May 2008 Posts: 5 Thanks: 0  using partial derivatives
simple but i think its complicated: f(x,y)=sin(xy^2)/x i used quotient rule for first partial of Fx and Fy, but its seems very complicated to do it a second time for Fxy 
July 2nd, 2008, 08:27 PM  #2  
Member Joined: Jun 2008 Posts: 38 Thanks: 0  Re: using partial derivatives Quote:
So then and then  
July 2nd, 2008, 09:17 PM  #3 
Newbie Joined: May 2008 Posts: 5 Thanks: 0  Re: using partial derivatives
[quote="Mathstud28"][quote="tbdevilrays"]simple but i think its complicated: f(x,y)=sin(xy^2)/x ok, i got there, then how would you take the second partial derivative of y? 
July 9th, 2008, 04:34 PM  #4  
Member Joined: Jun 2008 Posts: 38 Thanks: 0  Re: using partial derivatives Quote:
 
July 13th, 2008, 08:34 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 20,753 Thanks: 2136  so Differentiating with respect to y the expression found for gives the same result. 

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