For the function f(x,y)=yln(x)f(x,y) = y \ln(x)f(x,y)=yln(x), what is the mixed partial derivative fxyf_{xy}fxy?
1x\frac{1}{x}x1
yx\frac{y}{x}xy
0
−yx2-\frac{y}{x^2}−x2y