" The solution of "xd(xy)=((f(xy))/(f^(1)(xy)))dx" is "

The solution of xd(xy)=((f(xy))/(f'(xy)))dx

The solution of the ( dy )/(dx) = (xy+y)/(xy+x) is :

The solution of the ( dy )/(dx) = (xy+y)/(xy+x) is :

The solution of (1)/(y^(2)) (dy)/(dx) + (1)/(xy) =1 is

The solution of (1-x^(2)) (dy)/(dx) + xy = xy^(2) is

The solution of (dy)/(dx)=1+y+y^(2)+x+xy+xy^(2) is

If f:RtoR is a function which satisfies the condition f(x)+f(y)=f((x+y)/(1+xy)) for all x, y in R except xy=-1 , then range of f(x) is

If f:RtoR is a function which satisfies the condition f(x)+f(y)=f((x+y)/(1+xy)) for all x, y in R except xy=-1 , then range of f(x) is