Solving Fourier Transform Problems with Wolfram Alpha

[pedro_bb7]

[PLAIN]http://img716.imageshack.us/img716/3663/semttulont.png

f(x) = 0 (|x| > 1)
= x² (|x| < 1)
I know that thing on integral is [F(x)]^2, but I have no clue what to do now.

 

[vela]

Try applying Parseval's theorem.

 

[pedro_bb7]

Try applying Parseval's theorem.

Thanks, that is the right way.
Could you check the answer for me? $$\frac{\pi}{5}$$

 

[vela]

That's what Wolfram Alpha got.

http://www.wolframalpha.com/input/?...x+Cos[x])^2/x^6,+{x,+-Infinity,++++Infinity}]

 

[pedro_bb7]

That's what Wolfram Alpha got.

http://www.wolframalpha.com/input/?...x+Cos[x])^2/x^6,+{x,+-Infinity,++++Infinity}]

Thanks, very nice the wolfram site.
Nice idea you got to solve it.