# How can I compute a fourier series with Wolfram alpha?

How can I compute the Fourier series of a function on a interval using Wolfram ? For example, the Fourier of $$f(x)=x^2$$ on $$[0,2\pi]$$ prolonged on $$\mathbb R$$ by $$2\pi$$ periodicity. For example, if I put FourierSeries[x^2,x,n], Wolfram will give me back the fourier series on $$[-1,1]$$. I saw in the manual of Wolfram, but it's not written how to modify the interval. Any idea ?

• This question is not so much about mathematics as it is about using specific mathematical software. It might be on-topic at Mathematica stack exchange, but you would have to look up the rules there. – Mees de Vries Jan 8 at 16:33
• @MeesdeVries: If so, why is there a tag Wolfram Alpha ? – NewMath Jan 8 at 16:35
• I am retracting my close vote; I am surprised to find that questions about mathematical software are on-topic here. My bad. However, the rules explicitly explicitly rule out Mathematica, and it is possible that WolframAlpha falls into that category. – Mees de Vries Jan 8 at 16:39
• @NewMath I was thinking something similar, but it looks like past questions with that tag (on topic) are usually asking about errors or results they have got from WA, and are querying their validity. So perhaps that could be a reason. – John Doe Jan 8 at 16:39