simplify
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(3root6)^2+(5root6)^2
=》a^2+b^2=(a+b)^2-2ab
then
(3root6+5root6)^2-2.3root6.5root6
=》a^2+b^2=(a+b)^2-2ab
then
(3root6+5root6)^2-2.3root6.5root6
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