Having a little trouble with this one:

Find the first Partial Derivatives xy/x^2+y^2

fx(x,y)= My interpretation was that in the numerator, x would be 1, leaving me with y

and in the denominator x^2 would be 2x and y^2 would be zero, so I am left with

y/2x, which is wrong. Not sure where I am mistaken so any help would be greatly appreciated. Thanks