Evaluate
\frac{IN\mu _{0}\left(l\sqrt{4x^{2}+4lx+D^{2}+l^{2}}+l\sqrt{4x^{2}-4lx+D^{2}+l^{2}}-2x\sqrt{4x^{2}+4lx+D^{2}+l^{2}}+4\sqrt{4x^{2}-4lx+D^{2}+l^{2}}\right)}{2l\sqrt{-16\left(lx\right)^{2}+\left(4x^{2}+D^{2}+l^{2}\right)^{2}}}
l\neq 0\text{ and }\left(|l|\neq 2|x|\text{ or }D\neq 0\right)
Factor
\frac{\left(\frac{1}{\sqrt{4x^{2}+4lx+D^{2}+l^{2}}}+\frac{1}{\sqrt{4x^{2}-4lx+D^{2}+l^{2}}}-\frac{2x}{l\sqrt{4x^{2}-4lx+D^{2}+l^{2}}}+\frac{4}{l\sqrt{4x^{2}+4lx+D^{2}+l^{2}}}\right)IN\mu _{0}}{2}
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