CPM Homework Help : A2C Problem 10-15

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

Hint (a):

Remember the angles from special right triangles.

Partial Answer (a):

30° and ?

Answer (b):

120° and ?

Hint (c):

Simplify the equation first.

Hint (d):

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.

Answer (d):

35.26°, 144.74°, 215.26° and 324.76°