

rút gọn
[imath]\dfrac{\sqrt{3+\sqrt{5}}}{\sqrt{3-\sqrt{5}}} +\dfrac{\sqrt{3-\sqrt{5}}}{\sqrt{3+\sqrt{5}}}[/imath]
[imath]\dfrac{\sqrt{3+\sqrt{5}}}{\sqrt{3-\sqrt{5}}} +\dfrac{\sqrt{3-\sqrt{5}}}{\sqrt{3+\sqrt{5}}}[/imath]
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