How do you find a basis for $\mathbb{C}$ as a vector space over $\mathbb{Q}(\zeta_n)$?

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In the comments on a question I posted earlier it was recommended that I find a basis for $\mathbb{C}$ as a vector space over $\mathbb{Q}(\zeta_n)$. How should I go about this? What would be a good reference for this?