### Home > PC > Chapter 6 > Lesson 6.4.2 > Problem6-156

6-156.

Solve for $α$.

1. $1 − \sin^{2} α = 0$

1. Solve for all values since it is not domain restricted.
2. Draw a unit circle to be sure you have all values.
3. Be careful with signs!

$α = \frac{\pi}{2}+2\pi n$

$α = \frac{3\pi}{2}+2\pi n$

1. $4 \cos^{2} α − 3 = 0$

1. Solve for all values since it is not domain restricted.
2. Draw a unit circle to be sure you have all values.
3. Be careful with signs!