Lös ut D (complex solution)
\left\{\begin{matrix}D=\frac{2A}{dx}\text{, }&d\neq 0\text{ and }x\neq 0\\D\in \mathrm{C}\text{, }&\left(x=0\text{ or }d=0\right)\text{ and }A=0\end{matrix}\right,
Lös ut A
A=\frac{Ddx}{2}
Lös ut D
\left\{\begin{matrix}D=\frac{2A}{dx}\text{, }&d\neq 0\text{ and }x\neq 0\\D\in \mathrm{R}\text{, }&\left(x=0\text{ or }d=0\right)\text{ and }A=0\end{matrix}\right,
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