Determine the partial derivative fxf_xfx of the function f(x,y)=ln(x/y)f(x,y) = \ln(x/y)f(x,y)=ln(x/y) for x,y>0x, y > 0x,y>0.
1x\frac{1}{x}x1
1xy\frac{1}{xy}xy1
yx\frac{y}{x}xy
−1x-\frac{1}{x}−x1