The 6 Trig Functions on the Unit Circle

arcsin(-√2/2)

• -π/4

• π/4

• 5π/4

• 5π/4 and 7π/4

sin (π/2)

• √3/2

• √2/2

• 1/2

• 1

cos (π/4)

• √3/2

• √2/2

• 1/2

• 1

• undefined

Answer explanation

• undefined

Answer explanation

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

• 1

• 1/2

• sqt3/2

• sqt2/2

• 1
• 2
• 3
• 4

cos(π)

• √3/2

• -√2/2

• -1

• 1

cos(30^o)

• - ½

• √3/2

• 2√3 /3

• ½

Choose the best match for the graph.

• 30^o

• 45^o

• 60^o

• 90^o