Find the solution of the three dimensional wave equation with the following initial conditions (where the solution is in the form of kirchoff's formula):

6. (20 points) Find the solution of three dimensional wave equation with the following initial conditions. u(x, y, z, 0) = 3, ut (x, y, z, 0) = 2. Hint: The solution for this equation is given by the Kirchhoff's formula u(x, to) = ATC2to (x)ds + 2to AT(2to JJs p(x) ds where S is a sphere of center co and radius cto