9.3 Trig Functions and the Unit Circle

Find  $\sin\ \theta$ 

•  $\frac{5}{\sqrt{29}}$  

•  $\frac{-2}{5}$  

•  $-\frac{5}{2}$  

•  $-\frac{2}{\sqrt{29}}$  

Find  $\cot\ \theta$ 

•  $\frac{5}{\sqrt{29}}$  

•  $\frac{-2}{5}$  

•  $-\frac{5}{2}$  

•  $-\frac{2}{\sqrt{29}}$  

Use the unit circle to find sin 270^o

• 1

• -1

• 0

• undefined

Use the unit circle to find cos 270^o

• 1

• -1

• 0

• undefined

Use the unit circle to find tan 270^o

• 1

• -1

• 0

• undefined

Use the unit circle to find csc 270^o

• 1

• -1

• 0

• undefined

Use the unit circle to find sec 270^o

• 1

• -1

• 0

• undefined

Use the unit circle to find cot 270^o

• 1

• -1

• 0

• undefined

Use the unit circle to find the exact value of sin 30^o

• $\frac{1}{2}$

• $\frac{\sqrt{3}}{2}$

• $\frac{\sqrt{2}}{2}$

• $-\frac{1}{2}$

Use the unit circle to find the exact value of cos 225^o

•  $-\frac{1}{2}$ 

• $\frac{\sqrt{3}}{2}$

• $\frac{\sqrt{2}}{2}$

•  $-\frac{\sqrt{2}}{2}$