1 Fig. 1 shows part of the graph of \(y = \sin x - \sqrt { 3 } \cos x\).
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\caption{Fig. 1}
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Express \(\sin x - \sqrt { 3 } \cos x\) in the form \(R \sin ( x - \alpha )\), where \(R > 0\) and \(0 \leqslant \alpha \leqslant \frac { 1 } { 2 } \pi\).
Hence write down the exact coordinates of the turning point P .