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 July 7th, 2010, 11:31 AM #1 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,935 Thanks: 1129 Math Focus: Elementary mathematics and beyond Partial derivatives If $f(x,\,y)\,=\,x^2\,+\,y^2$ then what is $f_{xy}$ ?
 July 7th, 2010, 12:50 PM #2 Guest   Joined: Posts: n/a Thanks: Re: Partial derivatives First, take the derivative w.r.t x This gives 2x Next, take the derivative of that result w.r.t y, this gives 0
 July 7th, 2010, 12:55 PM #3 Senior Member   Joined: Apr 2007 Posts: 2,140 Thanks: 0 $f_x (x,\,y)\,=\,2x$ $\therefore f_{xy} (x,\,y)\,=\,0$
 July 7th, 2010, 01:09 PM #4 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,935 Thanks: 1129 Math Focus: Elementary mathematics and beyond Re: Partial derivatives Got it. Thanks guys.

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