r = -rac{(5 - \sqrt{5})(\sqrt{5} + 1)}{(\sqrt{5} - 1)(\sqrt{5} + 1)} = -rac{5\sqrt{5} + 5 - 5 - \sqrt{5}}{5 - 1} = -rac{4\sqrt{5}}{4} = -\sqrt{5}.

Mon, 04 May 2026 13:57:31 +0000

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