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-(8 sin(2 pi k))/(pi k (k^2-64))*cos((kx)/2) -(16 sin^2(pi k))/(pi k (k^2-64))*sin((kx)/2)
-(8 sin(2 pi k))/(pi k (k^2-64))*cos((kx)/2) -(16 sin^2(pi k))/(pi k (k^2-64))*sin((kx)/2)
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