Werner Formulas/Also known as

Werner Formulas: Also known as

The Werner Formulas are also known as the Product Formulas or Product Formulae.

They can also be called the Product-to-Sum Formulas.

Some sources call them Simpson's Formulas, but this appears not to be backed up by the literature, and this name is usually applied to another set of formulas altogether.

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): product formulae
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): product formulae
• 2014: Christopher Clapham and James Nicholson: The Concise Oxford Dictionary of Mathematics (5th ed.) ... (previous) ... (next): Appendix $12$: Trigonometric formulae: Product formulae
• 2021: Richard Earl and James Nicholson: The Concise Oxford Dictionary of Mathematics (6th ed.) ... (previous) ... (next): Appendix $14$: Trigonometric formulae: Product formulae