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Trigonometry pp 123-137 | Cite as

The Addition Formulas

  • I. M. Gelfand
  • Mark Saul

Abstract

We now come to an important and fundamental property of the sine and cosine functions. If we know the values of sin α and cos α, and also the values of sin β and cos β, then we can calculate the values of \( \sin (\alpha + \beta ),\cos (\alpha + \beta ),\sin (\alpha - \beta ) \), and \( \cos (\alpha - \beta ) \).

Keywords

Acute Angle Addition Formula Opposite Angle Beautiful Proof Inscribe Angle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© I.M. Gelfand 2001

Authors and Affiliations

  • I. M. Gelfand
    • 1
  • Mark Saul
    • 2
  1. 1.Department of MathematicsRutgers UniversityPiscatawayUSA
  2. 2.Bronxville SchoolsBronxvilleUSA

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