eigenfun(n, x) generates the first n fourier series, which are *\{1/√{2*π}, 1/√{π}*cos(x), 1/√{π}*cos(x), ...\}* evaluated at x.

1 | ```
eigenfun(n,x)
``` |

`n` |
The number of eigenfunctions used to approximate the boundary. It should be a odd number. |

`x` |
The argument at which the eigenfunctions are evaluated. |

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