Nested radical

In algebra, a nested radical is a radical expression (one containing a square root sign, cube root sign, etc.) that contains (nests) another radical expression. Examples include

{\sqrt {5-2{\sqrt {5}}\ }},

which arises in discussing the regular pentagon, and more complicated ones such as

{\sqrt[{3}]{2+{\sqrt {3}}+{\sqrt[{3}]{4}}\ }}.

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