So t is positive, and the denominator is ≤4-2√3.

The expression y≥ 1/(4-2√3)=(2+√3)/2 or y.

T is negative, denominator ≥4+2√3,

The expression y≤ 1/(4+2√3)=(2-√3)/2 and y >；; 0

Therefore, the range y≥ 1+√3/2 or 0.