User:Xin-Xin W./sandbox2
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Failed to parse (unknown function "\DeclareMathSizes"): {\displaystyle \DeclareMathSizes{20}{20}{14}{10}}
![{\displaystyle {\sqrt[{3}]{2+{\sqrt {5}}}}+{\sqrt[{3}]{2-{\sqrt {5}}}}=1}](https://wikimedia.org/api/rest_v1/media/math/render/svg/03acce2987f35130e5ffe708755b8af262e2e253)