Simplify `sqrt(1+sqrt(6+sqrt9))`

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Simplify (sqrt(11)+sqrt(8))(sqrt(11)-2sqrt(2))

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Simplify (1)/(sqrt(6)-sqrt(5))+sqrt(6)-sqrt(5)

Simplify 1/sqrt2+1/(sqrt2+sqrt4)+1/(sqrt4+sqrt6)+1/(sqrt6+sqrt8)

30. Simplify 7sqrt(6)-sqrt(252)-sqrt(294)+6sqrt(7)

Simplify sqrt((sqrt(2)+1)/(sqrt(2)-1))

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Simplify (7sqrt3)/(sqrt10+sqrt3)-(2sqrt5)/(sqrt6+sqrt5)-(3sqrt2)/(sqrt15+3sqrt2)