0
8√3
13
2−4√3
Correct answer is B
(1+2√3)2=1+4√3+12=13+4√3
(1−2√3)2=1−4√3+12=13−4√3
13+4√3−(13−4√3)=13+4√3−13+4√3
= 8√3
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