Calculate the first-order partial derivative fxf_xfx of the function f(x,y)=yx+1f(x,y) = \frac{y}{x+1}f(x,y)=x+1y.
−y(x+1)2-\frac{y}{(x+1)^2}−(x+1)2y
y(x+1)2\frac{y}{(x+1)^2}(x+1)2y
−1(x+1)2-\frac{1}{(x+1)^2}−(x+1)21
000