$$\displaystyle\frac{d}{d 1 } \left(2x+ \frac{ 1 }{ { x }^{ 2 } } \right)$$
$\frac{d\left(2x^{3}+1\right)}{d_{1}x^{2}}$
$\frac{2dx^{3}+d}{d_{1}x^{2}}$
