# prosthaphaeresis formula

> trigonometric identity relating sums of trigonometric functions to products of trigonometric functions

**Wikidata**: [Q15140913](https://www.wikidata.org/wiki/Q15140913)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Prosthaphaeresis_formulas)  
**Source**: https://4ort.xyz/entity/prosthaphaeresis-formula


## References

1. Nuovo soggettario