CPM Homework Banner

Home > A2C > Chapter 10 > Lesson 10.1.1 > Problem 10-15

10-15.
  1. Solve each equation for 0 ≤ θ ≤ 360. You may need your calculator, but remember that your calculator only gives one answer. Most of these problems have more than one answer. Think about all four quadrants. Homework Help ✎

    1. sin θ = 0.5

    2. cos θ = −0.5

    3. 4 tan θ − 4 = 0

    4. 3 sin2 θ = 1

Remember the angles from special right triangles.

30° and ?

120° and ?

Simplify the equation first.

This is not one of the special angles.
Use a calculator to find one answer.
Looking at a unit circle may help you find the other answer.

35.26°, 144.74°, 215.26° and 324.76°