Question: Let V denote the complex vector space spanned by the functions 1, eix and e~ix, where x is a real variable. Which of the following

Let V denote the complex vector space spanned by the functions 1, eix and e~ix, where x is a real variable. Which of the following functions belong to V?
(a) sinx
(b) cosx-2i sinx
(c) cos h x
(d) sin2 1/2x
(e) cos2x

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