√(5+2√6)+√(7-4√3)-√(6-4√2)-⁴√(1-√2)⁴
=√(√3+√2)²+√(2-√3)²-√(2-√2)²-|-1√2|
=√3+√2+2-√3-2+√2-√2+1
=√2+1