Evaluate
\frac{-x\sin(2x)+x^{2}+1}{\left(\left(x^{2}+1\right)\cos(x)\right)^{2}}
Differentiate w.r.t. x
\frac{2\left(x^{4}\sin(x)+3\sin(x)\left(x\cos(x)\right)^{2}-\sin(x)\left(\cos(x)\right)^{2}-2x^{3}\cos(x)+2x^{2}\sin(x)-2x\cos(x)+\sin(x)\right)}{\left(\left(x^{2}+1\right)\cos(x)\right)^{3}}
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