# High School Trigonometry/Half-Angle Identities

This material was adapted from the original CK-12 book that can be found here. This work is licensed under the Creative Commons Attribution-Share Alike 3.0 United States License

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

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

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

This material was adapted from the original CK-12 book that can be found here. This work is licensed under the Creative Commons Attribution-Share Alike 3.0 United States License

- This page was last edited on 19 June 2015, at 15:29.
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