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(i) The principal value of cos -1\((\frac{-1}{2})\)

(ii) Express tan-1 \(\frac{cos x} {1-sin x}\) in the simplest form

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(i) cos-1 \(-\frac{1}{2}\) = π - cos\(\frac{1}{2}\) = π - \(\frac{π}{3}\) = \(\frac{2π}{3}\)

(ii) LHS = tan-1 (\(\frac{cosx}{1-sinx}\))

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