# High School Trigonometry/Sum and Difference Identities for Sine and Tangent

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${\displaystyle \sin {(u\pm v)}=\sin {u}\cos {v}\pm \cos {u}\sin {v}}$

${\displaystyle \cos {(u\pm v)}=\cos {u}\cos {v}\pm \sin {u}\sin {v}}$

${\displaystyle \tan {(u\pm v)}={\frac {\tan {u}\pm \tan {v}}{1\pm \tan {u}\tan {v}}}}$

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