Find the partial derivative fxf_xfx of the function f(x,y)=ysin(xy)f(x,y) = y \sin(xy)f(x,y)=ysin(xy).
y2cos(xy)y^2 \cos(xy)y2cos(xy)
ycos(xy)y \cos(xy)ycos(xy)
xycos(xy)xy \cos(xy)xycos(xy)
cos(xy)\cos(xy)cos(xy)