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Variational Methods Package Symbol

FirstIntegral

FirstIntegral[u]
represents a first integral associated with the variable u in the output of the function FirstIntegrals.

To use FirstIntegral, you first need to load the Variational Methods Package using Needs["VariationalMethods`"].

Needs["VariationalMethods`"]

FirstIntegral[x] appears in the output for this variational problem: