### Home > INT3 > Chapter 10 > Lesson 10.3.2 > Problem10-168

10-168.
1. Without a calculator, what are two solutions to each of the following equations for 0º ≤ θ < 360º? Homework Help ✎

1. cos(θ) =

2. tan(θ) = –1

3. sin(θ) =

4. cos(θ) = –

Draw a unit circle.

$\text{The cosine is where the }x\text{-value (red line) is }\frac{1}{2}.$