prove that 1. 1 + 3.5 1 1 1.3 5-7 7.9 4 2.
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Find the Fourier series of the function f(x) = x sin x on the interval [−π, π). Use
it to prove that
(1/1*3) -(1/3*5)+(1/5*7)-(1/7*9) +.........=(π-2)/4
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