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

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**Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "/mathoid/local/v1/":): {\displaystyle \sin{(u \pm v)} = \sin{u}\cos{v} \pm \cos{u}\sin{v}}**

**Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "/mathoid/local/v1/":): {\displaystyle \tan{(u \pm v)} = \frac{\tan{u} \pm \tan{v}}{1 \mp \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