Find the general solution of

y′′−2y′−3y=4e3x+ex(cos⁡(x)−2sin⁡(x))\displaystyle {y}{''}-{2}{y}'-{3}{y}={4}{e}^{{{3}{x}}}+{e}^{{x}}{\left({\cos{{\left({x}\right)}}}-{2}{\sin{{\left({x}\right)}}}\right)}

Use c2\displaystyle {c}_{{2}} and c3\displaystyle {c}_{{3}} for the arbitrary constants
y(x)=\displaystyle {y}{\left({x}\right)}=  

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