Given the partition $\{0,\frac{\pi}{2},\,\pi\}$, $\bar{x}_1=0$, and $\bar{x}_2=\frac{\pi}{2}$, find the Riemann sum $R(P)$ for the integral $\int_0^{\pi}\sin(x)\,dx$.
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Problem:
Given the partition $\{0,\frac{\pi}{2},\,\pi\}$, $\bar{x}_1=0$, and $\bar{x}_2=\frac{\pi}{2}$, find the Riemann sum $R(P)$ for the integral $\int_0^{\pi}\sin(x)\,dx$.