Essential University Physics: Volume 1 (3rd Edition)

$\vec{L'}=\vec{L}- \vec{h}\times\vec{p}$
We know the following equation: $\vec{L}=\vec{r}\times\vec{p}$ Thus, we can find: $\vec{L'}=\vec{L}-\Delta \vec{L}$ We know that the value of $\vec{r}$ in the equation $\vec{L}=\vec{r}\times\vec{p}$ is $\vec{h}$, so it follows: $\vec{L'}=\vec{L}- \vec{h}\times\vec{p}$