On the one hand, it resembles the classical wave equation.

Central to the study of electromagnetic waves is the wave equation.

Maxwell's equations can be written in the form of a wave equation with sources.

The second constant can be replaced giving the following wave equation.

The approach illustrated above works for equations more general than the wave equation.

(See the article on the wave equation for more about this).

The wave equation for such a potential is given as:

It plays important role in solving the classical wave equation.

The first two terms are the same as a normal wave equation.

The last two terms are unique to 4-derivative wave equations.