Learning Objectives:

__Math Tutoring on Sum and Difference Trigonometric Identities __

*Sum and Difference Identities for Cosine:*

*Sum and Difference Identities for Sine:*

*Sum and Difference Identities for Tangent:*

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**Hook Questions:**

*1. **Prove that cos(A+B) = cosAcosB – sinAsinB.*

*2. **Deduce tan(A+B) with the help of Sum Identities of Sine & Cosine.*

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