Parseval's formula
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If f(x) = (pi - |x|)^2 on [ -pi, pi], prove that f(x) = (pi^2)/3 + Sum from n= 1 to infinity of (4/n^2)(coxnx) and deduce that the Sum from n=1 to infinity of 1/n^2 = (pi^2)/6 , and the Sum from n = 1 to infinity of 1/n^4 = (pi^4)/90
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