Unit Circle

sin π/4

• √2∕2
• 1/2
• √3/2
• 0

tan 7π/4

• -1
• 1
• √2/2
• undefined

cot 3π/4

• -√2/2
• -1
• 1
• √2/2

sin 2π/3

• 1/2
• -1/2
• √3/2
• -√3/2

tan (-π)

• undefined
• 0
• 1
• -1

cos(5π/3)

• √3/2

• -√3/2

• 1/2

• -1/2

• √2/2

cos(11π/6)

• √3/2

• -√3/2

• 1/2

• -1/2

• √2/2

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

• 1
• 0
• -1
• 1/2

What is the radius of a unit circle?

• 1
• 2
• 1/2
• 0

What is a complete circle in radians?

• π
• 2π
• 1/2 π
• 1