Question
यदि $f(x) = \left\{ \begin{array}{l}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,1,\,\;when\,\,\,0 < x \le \frac{{3\pi }}{4}\\2\sin \frac{2}{9}x,\;\,when\,\,\frac{{3\pi }}{4} < x < \pi \end{array} \right.,$ तो
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$(A)$ $\frac{\pi}{2}$ $(B)$ $\frac{\pi}{6}$ $(C)$ $\frac{2 \pi}{3}$ $(D)$ $\frac{5 \pi}{6}$