The taylor series can obviously be truncated, because the coeffecient of each series gets smaller and smaller due to the factorial.(adsbygoogle = window.adsbygoogle || []).push({});

However this is not the case with the fouriers series, there is no obvious reason why the coeffecients should get smaller and smaller.

So my question is, what kind of series can be truncated for an approximation?

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# Which series can be truncated?

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