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Dear Student, y = \cos^{- 1} x + \cos^{- 1} \{\frac{x}{2} + \frac{\sqrt{3 - 3 x^{2}}}{2}\} Let x = cosm \cos^{- 1} (cosm) + \cos^{- 1} \{\frac{cosm}{2} + \frac{\sqrt{3 (1 - \cos^{2} m)}}{2}\} = m + \cos^{- 1} \{\frac{cosm}{2} + \frac{\sqrt{3 \sin^{2} m}}{2}\} = m + \cos^{- 1} \{\frac{cosm}{2} + \frac{sinm \sqrt{3}}{2}\} = m + \cos^{- 1} \{\cos 60 cosm + \sin 60 sinm\} = m + \cos^{- 1} \{\cos (60 - m)\} = m + 60 - m = 60 degree = \frac{π}{3} radian Regards

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