Evaluating Trig Values

What trig function is positive in quadrant 3?

• all of them

• sine
  

• cosine

• tangent

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

• sqt2/2

• 1/2

• 1

• sqt3/2

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

• 1

• 1/2

• sqt3/2

• sqt2/2

tan(225°)

• -1

• √2

• 2√3/3

• 1

tan(3π∕4)=

• 0
• 1
• -1 
• undefined

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)