-integrate(integrate(e^{(y-x)/kappa}*sin(pi*(y-1))*cos(pi*(x-1))*pi/kappa^2, y=0..x), x=0..1)-integrate(integrate(e^{(y-x)/kappa}*sin(pi*(y-1))*cos(pi*(x-1))*pi/kappa^2, y=0..x), x=0..1)

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