$$\displaystyle\frac{d}{d x } \left( { \left(2x-3 \right) }^{ 3 } + \frac{ 1 }{ ( { x }^{ 2 } -x+1) } + \sqrt{ { x }^{ 2 } +1 } \right)$$
$\frac{24\sqrt{x^{2}+1}x^{6}-120\sqrt{x^{2}+1}x^{5}+270\sqrt{x^{2}+1}x^{4}+x^{5}-372\sqrt{x^{2}+1}x^{3}-2x^{4}+330\sqrt{x^{2}+1}x^{2}+3x^{3}-182x\sqrt{x^{2}+1}-2x^{2}+55\sqrt{x^{2}+1}+x}{\sqrt{x^{2}+1}\left(x^{2}-x+1\right)^{2}}$
