Gouden fyk: ferskil tusken ferzjes
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Rigel 22:
Dêrfoar jildt dus:
:<math>\varphi = 1 + \tfrac{1}{\varphi}</math>,
wat
:<math>\varphi^2 = \varphi + 1 </math>,
:<math>\varphi^2 - \varphi - 1 = 0</math>,
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