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Half Angle Identities
Half Number Identities

Trig identities that show how to find the sine, cosine, or tangent of half a given angle.

 

Half Angle Identities

  or  

  or  

  or    or  

 

See also

Double angle identities

 


  this page updated 27-aug-12
Mathwords: Terms and Formulas from Algebra I to Calculus
written, illustrated, and webmastered by Bruce Simmons
NCTM Web Bytes December 2004 Web Bytes March 2005 Web Bytes