High School Trigonometry/Half-Angle Identities

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\sin^{2}{u} = \frac{1 - \cos{2u}}{2}

\cos^{2}{u} = \frac{1 + \cos{2u}}{2}

\tan^{2}{u} = \frac{1 - \cos{2u}}{1 + \cos{2u}}