INSTRUCTOR: Find the divergence of F for f of x comma y comma z equal to angle bracket xy comma 5 minus z squared times y comma x squared plus y squared close angle bracket. By the definition of divergence, we need to find-- so I'm going to write this, divergence of F equals P sub x plus Q sub y plus r sub z. And if we take each of those partials, this'll be equal to y plus a negative z squared plus 0 so that the divergence of F is equal to y minus z squared.