CPM Homework Banner
8-16.
  1. Without a calculator, find two solutions 0° ≤ θ < 360° that make each of the following equations true. Homework Help ✎
    Without using a calculator icon

    1. cos θ =

    2. tan θ = −1

    3. sin θ =

    4. cos θ = −

Draw a unit circle.

Answers: 60° and 300°

135° and 315°

Draw and label a unit circle as in part (a). Don't forget that the sine is the y-value! Which quadrants will the angles be in?

See part (c).