f(x) = -1 for -pi<x<o and f(x)= 1 for 0<x<pi i have b(n) = 4/n.pi but i wasnt sure how to use this to write it as fourier series.
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Originally Posted by panda f(x) = -1 for -pi<x<o and f(x)= 1 for 0<x<pi i have b(n) = 4/n.pi but i wasnt sure how to use this to write it as fourier series. Assuming you have the $\displaystyle b$'s right: $\displaystyle f(x)=\sum_{n=1}^{\infty} b(n) \sin(nx) = \sum_{n=1}^{\infty} \frac{4 \pi}{n} \sin(nx) $ subject to the usual restrictions on $\displaystyle x$ RonL
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