(x-y)(x+y)/xy
(1-sqr3-1-sqr3)(1-sqr3+1+sqr3)/(1-sqr3)(1+sqr3)=
=-4sqr3/(-2)=2sqr3
P.S. sqr это корень))
(x-y)(x+y)/xy
(1-sqr3-1-sqr3)(1-sqr3+1+sqr3)/(1-sqr3)(1+sqr3)=
=-4sqr3/(-2)=2sqr3
P.S. sqr это корень))