Using All Trigonometric Identities
Topic Index | Algebra2/Trig Index | Regents Exam Prep Center

 

Trigonometric Identities

Reciprocals Quotients Pythagorean

 

When simplifying expressions, or factoring expressions, look for common factors.
If none exist, look for related functions from the identities that will assist in the simplification.

Examples:

1.  

Substitute:

 


 

2.  

Version used:



Substitute:

 


 

3.  


Factor difference of perfect squares.

Substitute:

 

 


 
 

 

4.   Multiply and express as a monomial:
              


Version used:


 

 


 

 

How to use your
TI-83+/84+ graphing calculator  to verify trigonometric identities.
Click calculator.