y=3/2+8/π²{－cos(πx/2)-1/2cos(πx)-1/9cos(3πx/2)-1/25cos(5πx/2)},x=-2 to 2y=3/2+8/π²{－cos(πx/2)-1/2cos(πx)-1/9cos(3πx/2)-1/25cos(5πx/2)},x=-2 to 2

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