Find the solution ${\bf r\it(t)}$ of the differential equation with the given initial condition:

$${\bf r\it'(t)}=\left<\sin 3 t,\sin 6 t,3 t\right> , {\bf r\it(0)} = \left<8,9,6\right>$$ ${\bf r\it(t)}=\langle$$,$$,$$\rangle$