My homework assignment is
Prove that $$\partial_\beta F_{\gamma \delta} + \partial_\gamma F_{\delta \beta} + \partial_\delta F_{\beta \gamma} = 0$$ with the electromagnetic tensor
$$F_{\alpha \beta} = \begin{pmatrix} 0 & -E_1 & - E_2 & -E_3 \\ E_1 & 0 & B_3 & -B_2 \\ E_2 & -B_3 & 0 & B_1 \\ E_3 & B_2 & -B_1 & 0 \end{pmatrix}$$
leads to the following Maxwell's equations $$\operatorname{div} \mathbf{B} = 0$$ $$\operatorname{rot} \mathbf{E} = - \frac{1}{c} \frac{\partial \mathbf{B}}{\partial t}$$
I know that the first equation is equivalent to $\partial_\beta \tilde{F}^{\beta \alpha} = 0$ with $\tilde{F}^{\mu\nu} := \frac{1}{2}\, \varepsilon^{\mu\nu\alpha\beta}\,F_{\alpha\beta}$ and from there it's easy to prove. But in the form $ \partial_\beta F_{\gamma \delta} + \partial_\gamma F_{\delta \beta} + \partial_\delta F_{\beta \gamma} = 0$ I cannot think of something else than to calculate all 64 equations, which would be rather lengthy.
Any advice? Is there an easy proof for that?