Quick maths question (stationary points)

Soldato
Joined
25 Nov 2004
Posts
4,788
Location
Hertfordshire
I'm doing questions about stationary points involving functions with two variables, and the first step is finding the partial 1st and 2nd derivatives with respect to x and y. But I also need to find

df
dxdy

where d is the partial derivative symbol...

My mind is completely blank, someone help meee! :)
 
Associate
Joined
27 Aug 2004
Posts
428
Location
Surrey
firstly differentiate the equation partially with respect to x alone, so treat y as a constant. Then takes this new result and differentiate partially with respect to y alone, treating x as a constant.

It doesnt matter which order you do this in, both results will be the same.
 
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