Solve the equation \(2 \sin \theta = - 1\) for \(0 \leqslant \theta \leqslant 2 \pi\), giving your answers in terms of \(\pi\).
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\includegraphics[alt={},max width=\textwidth]{ee79022b-b9a6-4076-8db7-67b9788ac28a-3_1032_1113_264_466}
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\caption{Fig. 5}
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Fig. 5 shows the graph of \(y = 2 ^ { x }\).