6.3:  Double-Angle, Power-Reducing, and Half-Angle Formulas

Introduction to double angle identities

 

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Find the exact value of a trig function of a double angle given information about the angle - two examples

 

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Here's a video that shows how I work with double angle identities when given information about an angle:

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Recognizing double angle identities to evaluate trigonometric expressions  

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Verifying identities (using double angles)

 

 

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Introduction to half angle identities

 

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Find exact values using half angle formulas

 

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Find a trig function of a half angle given information about the angle

 

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Verify an identity involving half angles