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Double-Angle and Half Angle IdentitiesPowerPoint Presentation

Double-Angle and Half Angle Identities

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Double-Angle and Half Angle Identities

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Double-Angle and Half Angle Identities

- If represents the measure of an angle, then the following identities hold for all values of .

- If and terminates in the first quadrant, find the exact value of each function.

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- If and terminates in the first quadrant, find the exact value of each function.
- we must first find the

- we must find to use the identity for .

- If represents the measure of an angle, then the following identities hold for all values of .

Since 15⁰ is a first quadrant angle and sine is positive in the first quadrant, choose the positive value.

Since 135 is a second quadrant angle and cosine is negative in the second quadrant, choose the negative value. Thus,

- Complete the worksheet due Wednesday