Is the underbraced term with a question mark correct in the second equation, or should it instead be the

divergence of pressure $($i$.$e$.\frac{\text{g}\text{r}\text{a}\text{d}*p}{})?$ Explain your answer.

Hint: You may want to use this identity:

grad$*(\frac{p}{b}ar(\frac{?}{\text{b}\text{a}\text{r}}(I)))=(gradp)\frac{*}{b}ar(\frac{?}{\text{b}\text{a}\text{r}}(I))+p(grad\frac{*}{b}ar(\frac{?}{\text{b}\text{a}\text{r}}(I)))$

where $\frac{?}{\text{b}\text{a}\text{r}}(\frac{?}{\text{b}\text{a}\text{r}}(I))$ is the identity tensor.