Question: Maplesoft giving wrong answer after substitution, need help

Hi all, 

I am trying to plot the amplitude spectrum of a square wave. I plotted the wave by using its fourier series but I want to find the 5th harmonic which should be around 0.5 however, maplesoft retruns it as 0.7 for some reason. When the stem plot is plotted even that look likes 0.5 at the 5th harmonic but the F(5) is giving wrong value. 

Please have a look at the screenshot and file attached.


(Note: Maple was not giving wrong answer, I accidently uploaded the wrong file and have edited/updated the question)

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