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Added math tags, not sure about it, modify/revert if you want
The golden ratio is a number, commonly known as phi, defined as 'phi * phi = phi + 1.' The value of phi is
The golden ratio is a number, commonly known as phi (<math>\varphi</math>), defined as
<math>\varphi^2 = \varphi + 1</math>. The value of phi is
:<math>\frac{1 + \sqrt{5}}{2}</math>
:<math>\frac{1 + \sqrt{5}}{2}</math>