Evaluating Trig by Unit Circle

Choose the best match for the graph.

• 30^o

• 45^o

• 60^o

• 90^o

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

• y/r

• x/r

• r/y

• y/x

sin (π/2)

• √3/2

• √2/2

• 1/2

• 1

cos (π/4)

• √3/2

• √2/2

• 1/2

• 1

Find the exact value of the expression using the unit circle:

Mathematical Equivalence

ON

tan(2π) ​ ​ ​

Mathematical Equivalence

ON

• -1
• 0
• undefined
• √3

sin(π/2) ​ ​

Mathematical Equivalence

ON

tan(π) ​

Mathematical Equivalence

ON