Question: Seperation of Variables

I need to solve this equation:

 

2*(diff(R, t))*sin(theta)*sin(phi)*(diff(phi, t))+2*(diff(R, t))*cos(theta)*cos(phi)*(diff(theta, t))-2*R*sin(phi)*cos(theta)*(diff(theta, t))*(diff(phi, t))+diff((diff(R, t))*cos(phi)*sin(theta), t)-R*sin(theta)*sin(phi)*(diff(diff(phi, t), t))+R*cos(phi)*cos(theta)*(diff(diff(theta, t), t))-R*cos(phi)*sin(theta)*((diff(theta, t))^2+(diff(phi, t))^2)+R*sin(theta)*cos(phi)*e^(-R^2) = 0

 

 

how would I do this?

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