2 (-(5*Power(k,6) + 2*Power(k,4)*(15 - 8*Sqrt(1 + Power(k,2)/Power(c - Complex(0,1)*k0,2)))*Power(c - Complex(0,1)*k0,2) + 8*Power(k,2)*(5 - 4*Sqrt(1 + Power(k,2)/Power(c - Complex(0,1)*k0,2)))*Power(c - Complex(0,1)*k0,4) - 16*(-1 + Sqrt(1 + Power(k,2)/Power(c - Complex(0,1)*k0,2)))*Power(c - Complex(0,1)*k0,6))/(48.*Power(k,4)) + (5*Power(k,6) + 2*Power(k,4)*(15 - 8*Sqrt(1 + Power(k,2)/Power(2*c - Complex(0,1)*k0,2)))*Power(2*c - Complex(0,1)*k0,2) + 8*Power(k,2)*(5 - 4*Sqrt(1 + Power(k,2)/Power(2*c - Complex(0,1)*k0,2)))*Power(2*c - Complex(0,1)*k0,4) - 16*(-1 + Sqrt(1 + Power(k,2)/Power(2*c - Complex(0,1)*k0,2)))*Power(2*c - Complex(0,1)*k0,6))/(24.*Power(k,4)) - (5*Power(k,6) + 2*Power(k,4)*(15 - 8*Sqrt(1 + Power(k,2)/Power(3*c - Complex(0,1)*k0,2)))*Power(3*c - Complex(0,1)*k0,2) + 8*Power(k,2)*(5 - 4*Sqrt(1 + Power(k,2)/Power(3*c - Complex(0,1)*k0,2)))*Power(3*c - Complex(0,1)*k0,4) - 16*(-1 + Sqrt(1 + Power(k,2)/Power(3*c - Complex(0,1)*k0,2)))*Power(3*c - Complex(0,1)*k0,6))/(24.*Power(k,4)) + (5*Power(k,6) + 2*Power(k,4)*(15 - 8*Sqrt(1 + Power(k,2)/Power(4*c - Complex(0,1)*k0,2)))*Power(4*c - Complex(0,1)*k0,2) + 8*Power(k,2)*(5 - 4*Sqrt(1 + Power(k,2)/Power(4*c - Complex(0,1)*k0,2)))*Power(4*c - Complex(0,1)*k0,4) - 16*(-1 + Sqrt(1 + Power(k,2)/Power(4*c - Complex(0,1)*k0,2)))*Power(4*c - Complex(0,1)*k0,6))/(48.*Power(k,4)) - (5*Power(k,6) + 2*Power(k,4)*(15 - 8*Sqrt(1 + Power(k,2)/Power(5*c - Complex(0,1)*k0,2)))*Power(5*c - Complex(0,1)*k0,2) + 8*Power(k,2)*(5 - 4*Sqrt(1 + Power(k,2)/Power(5*c - Complex(0,1)*k0,2)))*Power(5*c - Complex(0,1)*k0,4) - 16*(-1 + Sqrt(1 + Power(k,2)/Power(5*c - Complex(0,1)*k0,2)))*Power(5*c - Complex(0,1)*k0,6))/(240.*Power(k,4)) + (5*Power(k,6) + 16*Power(k0,5)*(-k0 + Sqrt(-Power(k,2) + Power(k0,2))) - 8*Power(k,2)*Power(k0,3)*(-5*k0 + 4*Sqrt(-Power(k,2) + Power(k0,2))) + 2*Power(k,4)*k0*(-15*k0 + 8*Sqrt(-Power(k,2) + Power(k0,2))))/(240.*Power(k,4)))/Power(k0,4)