Show that
So if you see my attempt here at first working around the tangent function decomposition [link], and making use of the identities , and , I haven't been going anywhere with this.
Appreciate any help. Thank you!
You can use the Mitagg_Leffler theorem. Here, I solve
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Regards.
Fernando Revilla
P.S. It is in Spanish. If necessary, I can translate it.