Fourier series help! http://i91.photobucket.com/albums/k285/jay1ty0/P2130029_zps640806c1.jpg I don't know anything about series fourier. Is this the right way? How to continue? Thanks in advance ;)

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that function is not a odd function, so a_n wont be zero ( nor will a_0) to continue with b_n, use integration by parts

Isn't 2x an odd function?

i've got: \[\frac{ 2 }{ \pi }\int\limits_{0}^{\frac{ \pi }{ 4}}2x \sin (2nx)dx\].. are you sure your process?

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