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At one point the book states:

Because k=(angular frequency)/c, we will represent the waves of the electric field as:

e^i (angular frequency ^ (x/c))

Now I am unsure what equation they used to get to this and also if its

e^i *(angular frequency ^ (x/c))

or

e^(i *(angular frequency ^ (x/c)))

Any help would be really great. Im sorry if this is a stupid question.

Thanks in advance,

Drew.