HELP urgently physics question

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Joined Mar 31, 2005
The wave eqn for a prticle in non conducting or free soace is given by Laplacian(E)=u*e*partial double derivative of (E) with respect to time
where E is the electric field
u,e are the permiability and permitivity of free space.

Now my question is laplacian(X)=Divergence(Gradient of X)
now X is a scalar Quantity here how can we take gradient of Electric Field E which is a vector quantity??

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