Using the period to help evaluate a trig function for an angle - free math help

The video tutorial explains the concept of the unit circle and radians, focusing on evaluating the cosine of negative angles. It discusses the importance of understanding the unit circle, simplifying calculations using denominators, and rewriting expressions in terms of π. The tutorial concludes with a final evaluation of the cosine of -3π/2, emphasizing the ability to perform these calculations mentally without drawing the circle.

What is the value of π in terms of radians?

• 9.42

• 1.57

• 6.28

• 3.14

How is the unit circle divided to handle large angles?

• By using fractions of 360

• By using degrees

• By using fractions of π

• By using fractions of 180

What is the cosine of -3π/2?

• Undefined

• 1

• 0

• -1

What is the significance of the point (0, 1) on the unit circle?

• It represents the angle π/2

• It represents the angle 2π

• It represents the angle 0

• It represents the angle π

How many times does the angle -15π/2 go around the circle?

• 7 times

• 5 times

• 6 times

• 3 times