Double Angle Formula

Double Angle Identities

Open Ended

Use the Sum identity of sin to derive the double angle formula for  $$\sin\left(2\alpha\right)$$  

Poll

Were you correct?

• Yes

• No

Open Ended

Use the sum identity of cos to derive the double angle formula for  $$\cos\left(2\alpha\right)$$  

Poll

Were you correct?

• Yes

• No

Open Ended

Use the sum identity for tan to derive the double angle formula for  $$\tan\left(2\alpha\right)$$  

Poll

Were you correct?

• Yes

• No

Examples

• see Jamboard