`u=(x^2-y^2)/(x^2+y^2)` find `du/dx`?

u=(x^(2)-y^(2))/(x^(2)+y^(2)) find d(u)/(dx)?

If (x^2+y^2)^2=x y , find (dy)/(dx)

If (x^2+y^2)^2=x y , find (dy)/(dx)

If x^2+y^2=x-y find dy/dx

If x^2y^2=(x+y)^5 then find dy/dx

U=x^y find (dU)/dx

If x^2+y^2=x-y Find dy/dx

If sin^(-1)((x^2-y^2)/(x^2+y^2))=logat h e n(dy)/(dx)i se q u a lto (x^2-y^2)/(x^2+y^2) (b) y/x (c) x/y (d) none of these

If y=(x)/(x+2) find (d^2y)/dx^2

If U(x,y,z) =(x^(2) + y^(2))/(xy) + 3z^(2)y , find (del U)/(dx) + (del U)/(dy) + (del U)/(dz)