\frac { d y } { d x ^ { 3 } } - 3 \frac { d y } { d x ^ { 2 } } + 4 \cdot \frac { d y } { d x } - 2 y = c ^ { x } + \cos x
Solve for c
c=\left(|-\cos(x)-2y|\right)^{\frac{Re(x)-iIm(x)}{\left(Re(x)\right)^{2}+\left(Im(x)\right)^{2}}}e^{\frac{Im(x)arg(-\cos(x)-2y)-2\pi n_{1}iRe(x)-2\pi n_{1}Im(x)+iRe(x)arg(-\cos(x)-2y)}{\left(Re(x)\right)^{2}+\left(Im(x)\right)^{2}}}
n_{1}\in \mathrm{Z}
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