(b) Verify that another particular solution, G_{A}\left(t-t^{\prime}\right)=\frac{1}{\omega} \theta\left(t^{\prime}-t\right) \sin \omega\left(t-t^{\prime}\right) which is referred to as the advanced Green's function, satisfies the Green functiondifferential equation and the continuity conditions.Hint: Use problem

2 and lim, sin x /x = 0.