Expand (2+3)2(2 + \sqrt{3})^2(2+3)2 and (2−3)2(2 - \sqrt{3})^2(2−3)2
Hence simplify (2+3)2−(2−3)2(2 + \sqrt{3})^2 - (2 - \sqrt{3})^2(2+3)2−(2−3)2
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