Finding sine and cosine on a unit circle

sin 150

• -1/2
• -√3/2
• 1/2
• √3/2

Tags

CCSS.HSF.TF.A.2

cos 90

• 0
• 1
• -1
• undefined

Tags

CCSS.HSG.SRT.C.7

cos 135

• √2/2
• -√2/2
• √3/2
• -√3/2

Tags

CCSS.HSG.SRT.C.7

sin 180

• 0
• 1
• -1
• undefined

Tags

CCSS.HSG.SRT.C.7

sinθ is positive in

• the 1st and 2nd quadrants
• the 1st and 3rd quadrants
• the 1st and 4th quadrants
• the 2nd and 3rd quadrants

cosθ is positive in

• the 1st and 2nd quadrants
• the 1st and 3rd quadrants
• the 1st and 4th quadrants
• the 2nd and 3rd quadrants

Based on your unit circle cos(30^o)=

• 1
• 1/2
• (√3)/2
• (√2)/2

Based on your unit circle cos(0^o)=

• 1
• 0
• -1
• 1/2

Based on your unit circle cos(90^o)=

• 1
• 0
• -1
• 1/2

Based on your unit circle sin(90^o)=

• 1/2
• 0
• -1
• 1