Operator nabla example

1. The problem statement, all variables and given/known data

So I have this rather komplex example and im looking for help.

∇(3(r*a)r)/R⁵ -a/R⁵)

r=xe_x+ye_y+ze_z

a-constant vector

R=r^1/2

2. Relevant equations







3. The attempt at a solution

So the nabla " works" on every member individualy,and i have to careful here:(r*∇a),because of analogue with derivative rule,am I correct?



So 9(r*a)/R^5+9r/R^5+9r/R^5-15(r*a)r*r/R^5-∇a/R^5



[b]1. The problem statement, all variables and given/known data[/







2. Relevant equations







3. The attempt at a solution

1. The problem statement, all variables and given/known data







2. Relevant equations







3. The attempt at a solution