Learning Objectives:

__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) = cos ^{2}A – sin^{2}A.*

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

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