Let V denote the complex vector space spanned by the functions 1, eix and e~ix, where x

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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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Applied Linear Algebra

ISBN: 978-0131473829

1st edition

Authors: Peter J. Olver, Cheri Shakiban

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