Question

If u=log (x^2+y^2)/x+y prove that x du/dx+y du/dy=1

Answer 1

be more specific. Is the log of the whole x and y expression? Or just the tpo. Or just the bottom. Is the denominator (x+y)? or is it /x and then a y added on the end

Answer 2

if u= log {x^2+y^2/x+y} prove that x du/dx + y du/dy=1