$(1$ point$)$ For the differential equation $y^{\text{'}\text{'}}+4y^{\text{'}}+13y=0,$

a general solution $isof$ the form $y=e^{-2x}(C_{1}sin3x+C_{2}cos3x),$

where $C_1$ and $C_2$ are arbitrary constants.

Applying the initial conditions $y(0)=3$ and $y^{\text{'}}(0)=-18,$ find

the specific solution.

$y=$