Question

x+y+z=0 , then prove that 1/(x^2+y^2-z^2)+1/(y^2+z^2-x^2)+1/(z^2+x^2-y^2) ​

Answer 1

Answer:

If x + y – z + xyz = 0, then 2x/(1 - x2) + 2y/(1 - y2) - 2z/(1 - z2) is equal to