Double Angle Trigonometric Identities

Double Angle Trigonometric Identities

Learning Objectives:

Understand and Apply Double Angle Trigonometric Identities

Double Angle Trigonometric Identities

Double Angle Identities of Sine:

 

Double Angle Identities of Cosine:

 

Double Angle Identities of Tangent:

 

 

Hook Questions:

1.     Prove that cos(2A) = cos2A – sin2A.

2.     Deduce cot(2A) with the help of Double Angle Identities of Cosine and Sine.

 

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