Evaluate Trigonometric Functions with Unit Circle

If I am looking on the unit circle at a point (x,y), how else can we write that point?

Think in terms of Trig. Let "t" be the angle measure.

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CCSS.HSF.TF.A.2

What is this?

• the unit circle

• an apple

• a car

• a book

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CCSS.HSF.TF.A.2

Two angles with the same initial and terminal sides are called___________. They differ by a multiple of 2π or 360°.

• coterminal angles

• opposite angles

• complementary angles

• adjacent angles

What do we call the graph of the equation x²+y²=1?

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CCSS.HSF-IF.C.7A

• -1
• 0
• undefined
• √3

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CCSS.HSF.TF.A.2

sin 60° = ​ ​ (a)   / ​ ​ (b)  

​ ​ ​

• 2

• 1

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CCSS.HSG.SRT.C.6

tan 7π/4

• -1

• 1

• √2/2

• undefined

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CCSS.HSF.TF.A.2

Evaluate cos(225°)

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CCSS.HSF.TF.A.2

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

Mathematical Equivalence

ON

Tags

CCSS.HSF.TF.A.2

Tags

CCSS.HSF.TF.A.2