I have this beautifull diff. eq. : y'=(1-y^2)/(1-x^2)

the solution is not a problem. (also with Derive6 or Ti89) y=(c(x+1)+x-1)/(c(x+1)-x+1)

but the book says : y=(x+c)/(cx+1) and verifying is correct too.

axes traslstions ? or something else ?

Thanks.