f(x) = / -1, -pi <= x < 0
\ 1, 0 <= x <= pi
(a) Find the Fourier series of f(x) on [-pi , pi]
(b) Use (a) to find the sum of the series
1 - 1/3 + 1/5 - 1/7 + 1/9 - 1/11 +-......
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