(a) Evaluate each of the following. Give answers in radians as a fraction of a whereаppropriate. \text { (i) } \cos ^{-1}\left(\frac{1}{2}\right) \text { (ii) } \sin ^{-1}\left(-\frac{\sqrt{3}}{2}\right) (b) Using your answers from part (a), find the values of 0 for each of the following over the interval [0, 27]. \text { (i) } \cos \theta=\frac{1}{2} \text { (ii) } \sin \theta=-\frac{\sqrt{3}}{2}

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