D[2 Atan(Sqrt[(1-k)/(1+k)] Tan[x/2])/(1-k^2)^(3/2)-(k Sin[x])/((1-k^2)*(1+k Cos[x])), x]D[2 Atan(Sqrt[(1-k)/(1+k)] Tan[x/2])/(1-k^2)^(3/2)-(k Sin[x])/((1-k^2)*(1+k Cos[x])), x]

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