Question: output of a function (A bug?)

Hello there!

I am facing a strange problem. I am defining a function as a finite series which involves the constants c[k] and the variable x. when I try to calculate the value of the function at zero it should give me c[1] but its giving me 0. it seems a bug in maple. i have tried it on two different versions.i.e. 2016 and 17

Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/ .


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