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.

$\operatorname{sin} θ = 0.5$
Hint (a):
Remember the angles from special right triangles.
Partial Answer (a):
$30° \text{ and ?}$

$\operatorname{cos} θ = −0.5$
Answer (b):
$120° \text{ and ?}$

$4 \operatorname{tan} θ − 4 = 0$
Hint (c):
Simplify the equation first.

$3 \operatorname{sin}^{2} θ = 1$
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):
$35.26°, 144.74°, 215.26° \text{ and } 324.76°$