simplify
`4/(sqrt7 +sqrt5)`

Rationlise the denominator and simplify: (2)/(sqrt5+ sqrt3)

Simplify: (sqrt 3 - sqrt 5)(sqrt 5+ sqrt 3)

Simplify: 1/(sqrt5 + sqrt4) + 1/(sqrt4 + sqrt3) + 1/(sqrt3 + sqrt2) + 1/(sqrt2 + sqrt1)

Rationlise the denominator and simplify: (1)/(2sqrt5-sqrt3)

Simplify: 2/(sqrt(5)+\ sqrt(3))+1/(sqrt(3)+\ sqrt(2))-3/(sqrt(5)+\ sqrt(2))

Rationlise the denominator and simplify: (3)/( 4- sqrt3)

Simplify: (3+sqrt 3)(3-sqrt3)

Simplify (5+sqrt(7))(5+sqrt(2))

Simplify {(\sqrt 5+\sqrt 3)\times (\sqrt 5 - \sqrt 3)}/(\sqrt 7- \sqrt 3)\times (\sqrt 7+ \sqrt 3)/(\sqrt 7+\sqrt 3)

Simplify: sqrt(-4) + sqrt(-16)- sqrt(-25)