Hello. I have a real issue with fractions, it seems! can anyone help me understand how to find the 2nd order derivitives for z=xy/(x+y) thanks for any help
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There are four to find. , , and You need to find and first, use the quotient rule.
Yeah sorry I know, and I know how to do partial derivitives, its just that I always get my numbers messed up when I have fractions, I'll try again, but for all I know I'm not even using the quotient rule correctly!
okay, so (xy)/(x+y). Use quotient rule (y).(x+y)-(xy).(y) / (x+y)^2... is that right??? now what?
for then I get
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