/ 2\
4*x - 2*x*sign\-1 + x /
$$- 2 x \operatorname{sign}{\left(x^{2} - 1 \right)} + 4 x$$
/ / 2\ 2 / 2\\
2*\2 - sign\-1 + x / - 4*x *DiracDelta\-1 + x //
$$2 \left(- 4 x^{2} \delta\left(x^{2} - 1\right) - \operatorname{sign}{\left(x^{2} - 1 \right)} + 2\right)$$
/ / 2\ 2 / 2 \\
-8*x*\3*DiracDelta\-1 + x / + 2*x *DiracDelta\-1 + x , 1//
$$- 8 x \left(2 x^{2} \delta^{\left( 1 \right)}\left( x^{2} - 1 \right) + 3 \delta\left(x^{2} - 1\right)\right)$$