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Plot[{Sum[BesselJ[0, 2 n x]/n^2, {n, 1, 30}], \[Pi]^2/6 - 2 x + x^2/2}, {x, -2, 5}]
Plot[{Sum[BesselJ[0, 2 n x]/n^2, {n, 1, 30}], \[Pi]^2/6 - 2 x + x^2/2}, {x, -2, 5}]
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