Question 446461
i am not sure that but this
 
(√((u))-√((v)))/(√((u))+√((v)))=(√((u))-√((v)))/(√((u))+√((v)))×(√((u))-√((v)))/(√((u))-√((v)))=(√((u))-√(v)))^2/((u)-v))=((u)-2√((u)(v))+(v))/((u)-(v))

is  EQUIVALENT!