`(sqrt5)^-4div(sqrt5)^-2=?`

(1+sqrt5)^4+(1-sqrt5)^4=?

(2 + sqrt5)/(2 - sqrt5)

3sqrt(512)div 4sqrt(16)div sqrt(576)=?

(5+sqrt7)(2+sqrt5)=?

Simplify each of the following : (3)/(5-sqrt(3))+(2)/(5+sqrt(3)) (ii) (4+sqrt(5))/(4-sqrt(5))+(4-sqrt(5))/(4+sqrt(5))(sqrt(5)-2)/(sqrt(5)+2)-(sqrt(5)+2)/(sqrt(5)-2)

2/(sqrt5),3/5,4/(5sqrt5),5/(25),?