Evaluate (complex solution)
y=fw\text{ and }fw=\frac{n}{n^{2}+1}
Solve for y
\left\{\begin{matrix}y=\frac{n}{n^{2}+1}\text{, }&f=\frac{n}{w\left(n^{2}+1\right)}\text{ and }w\neq 0\\y=0\text{, }&n=0\text{ and }w=0\end{matrix}\right.
Solve for w
\left\{\begin{matrix}w=\frac{n}{f\left(n^{2}+1\right)}\text{, }&y=\frac{n}{n^{2}+1}\text{ and }f\neq 0\\w\in \mathrm{R}\text{, }&y=0\text{ and }f=0\text{ and }n=0\end{matrix}\right.
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