Finding Exact Values Using Unit Circle

cos 0 =

• 0

• ¹/₂

• ^√2/₂

• ^√3/₂

• 1

cos -90°

• 0

• -1

• undefined

cos π =

• 0

• 1

• -1 

• undefined

cos (3π∕2)=

• 0

• 1

• -1 

• undefined

sin(3π∕2)=

• 0

• 1

• -1 

• undefined

tan(3π∕2)=

• 0

• 1

• -1 

• undefined

tan(3π∕4)=

• 0

• 1

• -1 

• undefined

Using the Unit Circle, find the exact value of this trig function.

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• The correct answer is not listed

cos -225°

sin -210°