Evaluate
\frac{4\ln(\frac{|x|}{\sqrt{x^{2}+1}})x^{4}-3x^{4}+8\ln(\frac{|x|}{\sqrt{x^{2}+1}})x^{2}-4x^{2}+4\ln(\frac{|x|}{\sqrt{x^{2}+1}})}{4\left(x^{2}+1\right)^{2}}+С
Differentiate w.r.t. x
\frac{sign(x)x^{6}-|x|x^{5}+3sign(x)x^{4}-3|x|x^{3}+3sign(x)x^{2}-3x|x|+sign(x)}{|x|\left(x^{2}+1\right)^{3}}
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