\left\{ \begin{array} { l } { ( x ) = \sin x } \\ { f ( x ) = x } \end{array} \right.
Solve for x, f
\left\{\begin{matrix}\\x=0\text{, }f\in \mathrm{R}\text{, }&\text{unconditionally}\\x\in \mathrm{R}\text{, }f=1\text{, }&-\sin(x)+x=0\end{matrix}\right.
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