Sin Cos and Tan on the Unit Circle

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

• 1/2

• 0

• -1

• 1

For what angles are sine and cosine the same?

• 0^o

• 45^o and 135⁰

• 45^o and 225⁰

• 45^o and 315⁰

What is the exact coordinates of  3π/4 on the unit circle?

• (−√2∕2, √2∕2)

• (−√2∕2, −√2∕2)

• (−√3∕2, −√2∕2)

• (√2∕2, −√2∕2)

• -√3/2
• -½
• -√2/2
• -1

• 1
• -1
• 0
• √2/2

• √3/3
• √3
• 1
• undefined

• ½
• √2/2
• √3/2
• 1

Based on the unit circle, what is the value of cos?

• y

• x

• x/y

• y/x

Based on the unit circle, what is the value of tan?

• y/r

• x/r

• r/y

• y/x

Find sin(-240°)

• (√3)/2)

• (-1/2)

• (√2/2)

• (1/2)