# Weierstrass substitution

> technique to integrate rational functions involving trigonometric functions.

**Wikidata**: [Q663628](https://www.wikidata.org/wiki/Q663628)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Tangent_half-angle_substitution)  
**Source**: https://4ort.xyz/entity/weierstrass-substitution


## References

1. Freebase Data Dumps. 2013