35.x^(2)-2+(1)/(x^(2))-y^(2)

Factorize x^2-2+(1)/(x^2)-y^2

Solve: (y)/(x)(dy)/(dx)+(2(x^(2)+y^(2))-1)/(x^(2)+y^(2)+1)=0

If x+y+z=0 then what is the value of (1)/(x^(2)+y^(2)-z^(2)) +(1)/(y^(2)+z^(2)-x^(2)) +(1)/(z^(2)+x^(2)-y^(2)) ?

if x^(2)+y^(2)+(1)/(x^(2))+(1)/(y^(2))=4 then find the value of x^(2)+y^(2)