Sum to Product Identities and Product to Sum Formulas

This trigonometry video tutorial explains how to use the sum to product identities and product to sum formulas to evaluate sine and cosine functions.  This video contains plenty of trig examples and practice problems for you to work on.

Bearing Problems and Navigation:                  
Bearing Problems & Navigation

Two Triangle Problems - More Examples:      
Trigonometry - How To Solve Right Tri...

Verifying Trigonometric Identities:                      
Verifying Trigonometric Identities

Sum and Difference Identities:                            
Sum and Difference Identities of Sine...

Double Angle Identities:                                        
Double Angle Identities & Formulas of...

Verifying Trig Identities With Double Angles:    
Verifying Trigonometric Identities Wi...

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Power Reducing Formulas:                                  
Simplifying Trigonometric Expressions...

Half Angle Formulas:                                            
Half Angle Formulas & Identities - Ev...

Verifying Trig Identities Using Half Angles:        
Verifying Trigonometric Identities Us...

Inverse Trig Functions With Double Angles:      
Inverse Trig Functions With Double An...

Right Triangle Trig With Half Angle Identities:  
Right Triangle Trigonometry and Half ...

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Solving Trig Equations - Finding All Solutions:  
Solving Trigonometric Equations By Fi...

Solving Trig Equations With Multiple Angles:    
How To Solve Trigonometric Equations ...

Solving Trig Equations With Double Angles:      
Solving Trigonometric Equations By Fa...

Trigonometry Final Exam Review:                      
Trigonometry Final Exam Review

Final Exams and Video Playlists:  
https://www.video-tutor.net/

Full-Length Videos and Worksheets:
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