(4−2√3) (2+3√3) 8+12√3−4√3−18
−−−−−−−−−−−−−−−−−−−−−−−− = −−−−−−−−−−−−−−−−−−−−−−−−
(2−3√3) (2+3√3) 4−9
−10+8√3 −8√3+10
=−−−−−−−−−−−−−−−−−−−−−−= −−−−−−−−−−−−−−−−−−−−
−5 5