Sum and Difference Identities Part I 

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Sum and Difference Identities Part I

Sum and Difference Identities Part II


Double Angle Identities pt I

Double Angle Identities pt II

Half Angle Identities 

More Half Angle Identities

Derivation of the Half Angle Identities

Derivation of the Double Angle Identities

Proving the Sum and Difference Identities