$$\left(\hat{e}_{R}\partial_{R}+\frac{1}{R}\hat{e}_{\theta}\partial_{\theta}+ \frac{1}{R}\sin(\theta) \hat{e}_{\phi}\partial_{\phi}\right)\cdot\bar{F}$$
where
$$\bar{F}=R^3 ( \cos(\phi)\sin(\theta)\bar{i}+\sin(\phi)\sin(\theta)\bar{j}+\cos(\theta)\bar{k}).$$
How can I calculate this with $\hat{i},\hat{j},\hat{k},\bar{R},\bar{\theta}, \bar{\phi}$?