## Pythagorean Identities

**cos² α + sin² α = 1**

**sec² α = 1 + tan² α **

**csc² α = 1 + cot² α **

## Cofunction Identities

## Even-Odd Identities

### Sum and Difference of Angles Identities

### Double Angle Identities

### Half Angle Identities

### Sum to Product Identities

### Product to Sum Identities

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