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derivative of 1/(2*pi*i)*(-a*0.5*(z-1)*log((z-1)/(z+1))+b*0.5*(z+1)*log((z-1)/(z+1))) wrt z
derivative of 1/(2*pi*i)*(-a*0.5*(z-1)*log((z-1)/(z+1))+b*0.5*(z+1)*log((z-1)/(z+1))) wrt z
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