Werner Formula for Cosine by Sine/Also presented as

Werner Formula for Cosine by Sine: Also presented as

The Werner Formula for Cosine by Sine can also be seen in the form:

$2 \cos \alpha \sin \beta = \map \sin {\alpha + \beta} - \map \sin {\alpha - \beta}$

Sources

• Weisstein, Eric W. "Werner Formulas." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/WernerFormulas.html