Find the particular solution of the differential equation
\(\frac{\mathrm{d}^{2} y}{\mathrm{~d} x^{2}}-2 \frac{\mathrm{~d} y}{\mathrm{~d} x}+y=4 \cos x\)
given that, when \(x=0, y=-4\) and \(\frac{\mathrm{d} y}{\mathrm{~d} x}=3\).