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Identity (Equation or Inequality)

An equation which is true regardless of what values are substituted for any variables (if there are any variables at all).

 

Identities:    

1 + 1 = 2

(x + y)2 = x2 + 2xy + y2

a2 ≥ 0

sin2 θ + cos2 θ = 1

 

See also

Conditional equation, conditional inequality, trig 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