June 30th, 2009, 11:23 AM  #1 
Newbie Joined: Jun 2009 Posts: 1 Thanks: 0  Need help differentiating
Find dy/dx for f(x,y)=3xe^(x/y^2). Simplify Completely. I believe you have to differentiate Fx(x,y) and Fy(x,y) then use the formula dy/dx=Fx(x,y)/Fy(x,y) 
June 30th, 2009, 11:57 AM  #2 
Senior Member Joined: Jun 2009 Posts: 150 Thanks: 0  Re: Need help differentiating
Looks senseless to me. To compute dy/dx we need y to be a function of x. But we are merely given a function of both variables.

June 30th, 2009, 12:57 PM  #3 
Senior Member Joined: May 2008 From: Sacramento, California Posts: 299 Thanks: 0  Re: Need help differentiating
I'm guessing we solve for y and differentiate. Differentiate: 1. Apply the chain rule to . 2. Apply the quotient rule to . 3. Apply the chain rule to . You should get: Is that the way to do it? 
July 1st, 2009, 05:17 AM  #4 
Senior Member Joined: Jun 2009 Posts: 150 Thanks: 0  Re: Need help differentiating
That's one guess. Another guess would be that the problem really was: Find of ... But until the OP clarifies, who knows? 

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