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The question is find the Fourier series of "|cost| for all t". I already found the fourier series

But now the question asks " At which values of $x$, does the series fail to converge to ? To what values does it converge at those points? "

So what to do ?

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up vote 1 down vote accepted

That will converge for all $x$; the function is Lipschitz continuous, and so its Fourier series converges everywhere. (see, for instance, the answer to this question)

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That means this series do not fail to converge is it BaronVT? – Garett Sep 6 '12 at 11:58
Right, it does not fail to converge anywhere. – BaronVT Sep 6 '12 at 18:54

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