Answer
$$-1$$
Work Step by Step
\begin{align*}
\lim _{x \rightarrow \pi}\sin \left(\frac{x}{2}-\pi\right)&=\sin \left(\frac{\pi}{2}-\pi\right)\\
&=\sin \left(-\frac{\pi}{2}\right)\\
&=-1.
\end{align*}
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