$\overline{){{\mathbf{U}}}_{{\mathbf{E}}}{\mathbf{\left(}}{\mathbf{t}}{\mathbf{\right)}}{\mathbf{=}}\frac{\mathbf{1}}{\mathbf{2}}{{\mathbf{\epsilon}}}_{{\mathbf{0}}}{{\mathbf{E}}}^{{\mathbf{2}}}}$

What is the instantaneous energy density U_{E} (t) in the electric field of the wave?

Give your answer in terms of some or all of the variables in E = E_{0} sin (kx-wt).

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