What-can-be-the-functions-equivalent-to-these-series-and-how-can-we-find-the-Wronskain-of-both-on-the-given-interval-to-check-their-linear-independence-

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Two series are given. What can be the functions equivalent to these series and how can we find the Wronskain of both on the given interval to check their linear independence?

https://drive.google.com/file/d/0B5AHHZghS5nXaVJZeGd4c21OVEE/view?usp=docslist_api

Thank you.