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Home > PC > Chapter 4 > Lesson 4.2.1 > Problem 4-71

4-71.
  1. Find all values of θ from [0, 2] where the following equations are true. Sketching a picture of the unit circle may help. Homework Help ✎

    1. sin θ =

    2. cos θ = −

    3. sin θ = square root of 3

    4. cos θ = 0

What special angle(s) are involved?
What does the negative sign mean?

These angles are coterminal with the y-axis.