>>240
√[1+2√{x^2(1-x^2)}]+√[1-2√{x^2(1-x^2)}]
=√[{√(x^2)+√(1-x^2)}^2]+√[{√(x^2)-√(1-x^2)}^2]
=|√(x^2)+√(1-x^2)|+|√(x^2)-√(1-x^2)|
=√(x^2)+√(1-x^2)+|√(x^2)-√(1-x^2)|