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Homework Statement
If z=f(x,y) with u= x^2 -y^2 and v=xy , find the expression for (∂x/∂u).
the (∂x/∂u) will be used to calsulate ∂z/∂u.
my question is how to find (∂x/∂u).
I don't know what to keep constant. Maybe the question has some problem.
The answer is (∂x/∂u)=(x/2)/(x^2+y^2).
Can you please guide me .
Homework Equations
The Attempt at a Solution
I use u= x^2 -y^2, keep y constant , then get du/dx=2x , then 1/(du/dx)
or keep y constant, then x=√(u+y^2), get dx/du= 1/2x?
Or I should not keep anything constant? or the question is wrong?
really thank