Double Angle and Half Angle

Double Angle Practice

Open Ended

What steps do we need to take to solve our double angle formulas?

Independent Practice

 $\tan\theta=-\sqrt{3}$ , located in Quadrant 2

Multiple Choice

The length of the hypotenuse is

• 2

• 4

• 7

• 5

Multiple Choice

$$\cos\theta\$$  is 

• $$-\frac{1}{2}$$  

• $$\frac{1}{2}$$  

• $$\frac{\sqrt{3}}{2}$$  

Multiple Choice

$$\sin\theta$$  is 

• $$\sqrt{3}$$  

• $$\frac{\sqrt{3}}{2}$$  

• $$\frac{1}{2}$$  

Multiple Choice

$$\sin\left(2\theta\right)$$  is  $$-\frac{\sqrt{3}}{2}$$  

• True 

• False

Open Ended

$$\cos\left(2\theta\right)$$  is 

Multiple Choice

$$\tan\left(2\theta\right)$$  is 

• $$\sqrt{3}$$  

• $$-\sqrt{3}$$  

• $$\frac{\sqrt{3}}{2}$$  

• $$\frac{1}{2}$$  

Multiple Choice

If  $$\cos\left(2A\right).$$ , where  $\angle A$  is in Q1, find   $$\cos\left(2A\right).$$  

• $$\frac{-7}{9}$$

• $$\frac{7}{9}$$

• 1

• -1

Poll

Gauge your understanding

• Confident

• Need more practice

• Confused