Question 144587
{{{((sqrt(r) - sqrt(s))/(sqrt(r)+sqrt(s)))*((sqrt(r)-sqrt(s))/(sqrt(r)-sqrt(s)))}}}
={{{(sqrt(r) - sqrt(s))^2/(r-s)}}}
={{{(r - 2sqrt(r)*sqrt(s)+s)/(r-s)}}}
={{{(r - 2sqrt(rs)+s)/(r-s)}}}